I agree, “Young Frankenstein” was really good.
The scene with him and the monster dancing to “Putting on the Ritz” was hilarious. Especially when all the audience began throwing vegetables at them as if they had thought to bring them.
But the movie was crawling with highlights.
I'd start by adding Blazing Saddles, Killer Tomatoes, Holy Grail, Silent Movie, Mad Mad Mad World, Sleeper, and of course, Airplane.
But you have to make room for the closing scene from Life of Brian, and the whole shoe thing, UHF, A Fish named Wanda and (does Repo Man count as comedy?)...
The last time I tried to do a top ten list I had to quit at about 103 because I ran out of space.