It’s the last day of school, and Milhouse asks Bart which is his
favorite kind of sprinkler. What follows is indescribable. Milhouse
stares at the clock in desperation while Bart looks outside and
watches ice cream men prepare for the summer. Finally, the bell
rings.

[bell rings]
Milhouse: School’s out! Up yours, Krabappel!
[runs out, while other students sit]
Krabappel: Well, I’m glad the rest of you remembered that summer
vacation starts at the end of the day, not the beginning.
– Milhouse suffers heat stroke, “Summer of 4 Ft. 2″

Lou: Here you go, ma’am.
[escorts Milhouse back into the classroom]
Krabappel: Mmm. Quick work. How’d you know he was gonna run?
Lou: We got someone on the inside.
[everyone glares at Martin who laughs sheepishly]
– Tell them what we do with squealers, “Summer of 4 Ft. 2″

[Fonte: The Simpsons Archive]