Beavis and Butt-head struggle to avoid laughing for an entire week, or else they will be expelled and sent to a school for juvenile delinquents. Problem is, Coach Buzzcut's teaching sex education, and he only makes this task difficult for them. After telling Beavis and Butt-head that it's sex education week, Buzzcut starts tormenting the boys to get them to laugh, saying that they will be discussing the penis, the vagina, the testicles, venereal disease, sexual intercourse, and mostly masturbation. After a while, Buzzcut takes roll call, starting with Butkis (this time, Beavis and Butt-head do not laugh at this, resulting in Butkis laughing tauntingly at them) and other dirty-sounding names.
After school, Beavis and Butt-head rush out the doors, not being able to keep themselves from laughing anymore and they let it all out while sweating continuously and panting and gasping for air.
Coach Buzzcut: So, BEAVIS AND BUTT-HEAD! I understand Mr. McVicker has made a little arrangement for you guys! Yeah, a little probation. You see, class, BEAVIS AND BUTT-HEAD HERE are not allowed to laugh for a whole week. That's right, AND IF THEY DO LAUGH, they'll be expelled, and they'll have to go to Hope High School, WHERE THEY'LL GET THEIR ASSES KICKED ON A DAILY BASIS BY ALL THE OTHER DELINQUENTS, HA HA HA!!
[The entire class laughs at their horrible situation, but Beavis and Butt-Head know they better not laugh at that comment.]
Coach Buzzcut: Well, I was REAL GLAD to hear that, because this is Sex Education Week. That's right, SEX ED WEEK! [He hears Beavis and Butt-Head trying to giggle, so he gets closer to them to start yelling in their faces.] We're going to be talking about THE PENIS!!! [He gets right into Butt-Head's face, as he tries to hold back from laughing.] We'll be talking about THE VAGINA!!! DO YOU THINK THAT'S FUNNY, BUTT-HEAD?! DO YOU FIND IT AMUSING THAT WE'LL BE TALKING ABOUT THE TESTICLES?! [Butt-Head covers his mouth, to stop himself from giggling too hard.] Yes, we're ALSO going to be talking about VENEREAL DISEASE! SEXUAL INTERCOURSE! THE SCROTUM! THE CLITORIS! AND... [He then pulls Butt-Head's hand away from his mouth. Butt-Head starts crying from holding it back so hard.] AND WE WILL DEFINITELY BE SPENDING A LOT OF TIME TALKING ABOUT MASTURBATION!!!
[The entire class explodes into laughter as Coach Buzzcut returns to his desk, while Beavis and Butt-Head look like their about to explode.]
Coach Buzzcut: Well, now that that's out of the way, let's take roll. BUTKISS!!!
Butkiss: Here! [He laughs, knowing they can't laugh at him anymore.]
Coach Buzzcut: GAYLORD!!! HIMEN!!!
[At the end of the day, Beavis and Butt-Head dart out of the school, and literally explode into laughter red faced and their colors returning thereafter, with sweat pouring off their bodies. A few hours later, as they finally make it home, they're still laughing from earlier.]
Butt-Head: And then, he said "penis"!
Beavis: Yeah! And then, he said "masturbation"!
Butt-Head: And then, he said "vagina"! That was cool!
On the Mike Judge collection DVD, most of this episode has been cut. In the original TV broadcast version, Beavis and Butt-head sit in the stalls contemplating their punishment before coming to Coach Buzzcut's class.
In the DVD version, when Buzzcut is teasing Butt-head, the lines "The scrotum! The clitoris!" are left out.
In the DVD version, a short scene where Coach Buzzcut calls roll is added after he teases Butt-head.
In the DVD version, a scene is added at the very end of "No Laughing Part 2," in which Beavis and Butt-head say things like, "He said "Penis"! Huh-huh!" In the original, the scene at the end of the episode was actually a carbon copy of the insect court scene from "Lawn and Garden."