Well it's impossible to pin down a favorite, so I'll just list a few and see if anyone picks up on em.
Lisa and the kids are hangin out at the Simpsons' beach house from Flanders. One of cool kids mentions his mom's from France so they only celebrate "Bastille Day". Then when Lisa suggests a beach party, one kid says "Hey I know where there's a beach", which is funny, but then the first kid adds "I know where we can get some baguettes!"https://www.youtube.com/watch?v=Zf557RtIuro
Kamp Krusty was rock solid.
Funniest moment from Lisa The Beauty Queen. It just stuck out in my mind more than the other gags for how bizarre it is. At Moe's, Homer looks up to see an ad for a girls' beauty pageant. It starts with the father throwing his daughter into the air. On the fifth toss, he throws her high enough to go out of the screen. She never comes back down and there's no clue to where she went. The little girl just straight up vanished.