"This Won't Hurt an Ed" is the 13th episode of Season 5 and the 115th episode of Ed, Edd n Eddy. In this episode, Eddy and Ed find out Kevin has a fear of needles through his medical file. They then decide to put this to their advantage by declaring to the other kids that it is Booster Shot Day. Kevin after finding out about this tries hard in hiding this secret, but Ed and Eddy do everything they can to make sure that he can't.
Ever the altruist, Double D has volunteered his services to the school nurse and become her assistant, and he is organizing various tools of the trade while his bored friends stand by. Of course, neither of them are very patient, and they cause disturbances until Eddy suggests they go for lunch. Ed agrees with this, as it is "WHOPPER WIENER WEDNESDAY!" and he wants to get a few wieners in him. Double D agrees, noting that some nourishment wouldn't hurt, but turns back to his work when he notices something out of place. Eddy is annoyed by this, and his annoyance level is only cranked up another notch when he hears a ruckus outside; apparently Kevin made 100 free throws in a row in gym today, and everyone's treating him like a hero. Eddy complains about this, and ignores his friends' attempts to mollify him until a misguided attempt by Ed sends a shelf full of student files crashing to the ground in a heap. While Double D hustles around gathering up the files, Eddy finds Kevin and begins reading. Soon, he finds out that Kevin is afraid of needles, and this gives him an idea. He grabs Ed and leaves while Double D continues work.
In the cafeteria, the Kevin party is still going strong, with Kevin even going so far as to autograph Jimmy's hot dog with ketchup. Even the appearance of Ed and Eddy in nurse outfits doesn't rile him to anything more than a mocking comment. Suddenly, the party stops, however, as Eddy mentions that it's Booster Shot Day. Ed shuffles out some leaflets, and the kids begin to worry about the needle. To drive the point home, Eddy mentions that Rolf's wiener looks dangerously hot, and pokes it with a sharp meat thermometer. Seeing this, the color drains from Kevin's face and he falls backwards, knocking his chair over.
Soon, though, Kevin gets up, and with a half-hearted excuse about the coach calling him, exits the lunchroom. Eddy begins to gloat, but none of the kids pay any attention, as they're too busy panicking themselves. Even Ed gets in on the panic, dragging Eddy out of the cafeteria to escape the needle he believes is coming for him. Eddy is able to stop his friend and remind him what's going on, however; when they see Kevin walking down the hall, Eddy grins and declares round two is on.
Kevin heads into a bathroom to try and calm his nerves. He splashes some water on his face and gives himself a pep talk. When he looks in the mirror, though, his eyes are drawn a few inches upwards to a ghastly picture of someone taking a needle straight through their arm. Seeing this, he stumbles backwards into a stall. He shuts the door behind him just as Ed and Eddy enter the bathroom, talking about sterilizing big, sharp needles. Kevin's heart is beating fast as he looks up and sees an air vent. Thinking quickly, he escapes into the vent. Naturally, Eddy notices, and he and Ed chuckle at how well their prank is going.
Kevin crawls through the vents, frantically trying to escape. When he comes to the first corner, though, he gets even more freaked out, as Ed sticks his head through a vent in their, revealing himself to have taken a needle straight through the brain. While Kevin crawls away as fast as he can, Ed ducks out, and he and Eddy laugh before Eddy mentions that he has another idea for how to continue the torture.
Double D, meanwhile, has finished his work in the nurse's office and is heading to the cafeteria to get some food when he runs into Jonny, who is bent over in front of him. Jonny pulls down his pants and says that he's ready, much to Double D's shock and revulsion. After instructing him to pull up his pants, Double D hears Nazz in the background, calling her mom to tell her she loves her, and sees Sarah pushing an armor-clad Jimmy forward and warning about how the needles can supposedly put a hole through a truck tire. Things get stranger yet when Rolf accosts the sock-on-head Ed-boy and gives him a jar of his father's stuffed olive pits and begs that the injection be as quick as possible before joining the line in the gym. Edd becomes more confused than ever when he reads on a poster that it's Booster Shot Day, and he checks his calender, sure that the day is a long way off.
Eddy has been busy with Ed all this time, and they've built a giant replica needle. When they find Kevin, they threaten him with it, and Kevin is backed into a corner by the nurse's office, strung out on fear and adrenaline. Suddenly, Double D jumps in and tells Eddy that there are no vaccinations scheduled for today. Hearing this, Kevin's heart rate slows to normal and he starts to realize he's been duped. While Kevin starts getting angry, Double D accuses Eddy of defrauding the whole school for his own self-gratification–and this only becomes more evident when Jimmy spots the giant booster shot and warns the other kids, who panic and run out of the gym. Eddy still believes that he has Kevin nailed, though, and he demonstrates to Edd by poking Kevin's arm with the shot. As it turns out, though, Kevin has gotten over his fear of the giant "needle", and is ready to beat Eddy into little tiny pieces with a golf club that formed part of the needle. Scared, Eddy pulls Double D in front of him and begs for help, and Edd is quick to offer it, by giving Kevin an alternate solution to his problem. Of course, this solution is going to hurt Eddy, but it will also help Kevin. You see, Double D was able to talk the nurse into showing Kevin a demonstration of a safely applied booster shot, and guess who the lucky piggy on the wrong end of the needle is?
Eddy: [dispassionately watching Ed inflate his face with the blood pressure cuff] "Gee, nice head, Ed!"
Ed: "Whopper Wiener Wednesday, Double D!"
Edd: [looking despairingly at the mess on the floor] "Oh dear. Do you have any idea how long it took me to arrange in alphanumerical order those confidential student files, Ed? Do you?" Ed: "Was it longer than a bread box?"
Kevin: [incredulous as Rolf kicks him] "Hey man, what gives?" Rolf: "Rolf honors Kevin with the Posterior Punt of Praise!"
Jimmy: [looking adoringly at Kevin] "He's so dexterous!"
Kevin: [mocking Eddy and Ed's medical outfits] "Well, if it ain't Florence Dorkendale and Nurse Twerpenstein."
Ed: "Tell 'em to line up in the gym, bonehead! Did I do good, Eddy?" Eddy: "Shut up, stupid!" Ed: "That's my line, Eddy."
Ed: "Needle? Run away! Evil! Pointy! Bad for Ed, Eddy!"
Eddy: [trying to freak Kevin out] "We'd better sterilize these sharp needles, Ed." Ed: "Say they're big, monobrow!"
Rolf: [groveling in front of Edd] "Double D Ed-boy, Rolf begs you, take this jar of Papa's filled olive pits and be quick with your pain-filled poke!"
Ed: [sagely] "A good buttock finds its own bench, Eddy!"
Eddy: [as he gets his shot from Nurse Prowse] "I hate needles!"
Jonny: "Me an Plank are next, nurse assistant Double D!" [He pulls down his pants, exposing himself to Edd.] Edd: [frantically covering his eyes] "GOOD LORD, JONNY! MAKE YOURSELF DECENT, MAN!"
Eddy: "Who's the big shot now, huh?! Get it?! Big, shot?" [laughing menacingly] "I'm too good!" Kevin: "That was really funny, dorky! So I guess it's my turn, right?" [grabbing a golf club] "Kiss your face goodbye, loser!"
When Ed smashes into the filing shelves in the nurse's office, the files come out, but between the Eds smashing into the shelf and Edd's lecture about "alpha-numerical order," you can see that there is a person in a photo with the name of 'Ryan.' You can also see a picture of a boy named James.
This is the second time Kevin revealed his fear that the Eds (or Ed and Eddy) are trying to get him. The first time was "See No Ed" where Kevin was afraid that they were trying to scam the kids when they [the Eds] were nowhere to be found.
Kevin loses his fear of needles after seeing Eddy get a shot as well as reading a pamphlet called 'Buddy Booster'.
The name for a fear of needles is called Trypanophobia, as mentioned by Edd. The only ones who don't appear to have this fear are Edd, Jonny, and Plank. (The Kanker Sisters may also qualify, as they didn't appear in this episode and were not seen panicking.)