The Simpsons! I have to admit first that I don't usually watch first run episodes of The Simpsons anymore. When I do, there's usually a few funny bits in it. It's right up there with most other shows on the air today. But it's not the laugh-every-minute show that it once was.
That fifth through tenth season is filled with some of the funniest stuff ever. I'll put any random episode up against the prime best episodes of Seinfeld or South Park. There's a reason why South Park did the whole "The Simpsons already did it" bit.
The best part is that they have jokes on many levels. When I've shown The Simpsons in class, the dumb slower kids had just as much to laugh at as the rest of us.
Without the Simpsons, its quite possible that people would still think that you can, in fact, win friends with salad.