Last Exit To Springfield
Homer Badman (these two have always been at my very top)
Krusty Gets Kancelled
Who Shot Mr. Burns? Part 1
You know, I haven't sat down and "rated" all these episodes, it's just a big long blur of "classics." After the first four or five I could have easily listed another 5 from 1992-96 or so.
I only laughed maybe twice at the first season of SP. The episode with the volcano, or where the guy's leg is Patrick Duffy, what a dumb gag. The laugh was when Mr. Hankey jumped in Cartman's face.