The hardest I ever laughed at Blazing Saddles was one time it was shown on TV.
A lot of humor is based on violating the audience's expectations. You were familiar with the movie, so you
expected crude language and farting at the campfire. You weren't expecting silence.
This wouldn't have worked for someone unfamiliar with the movie. Personally, I never even bothered to seriously watch it on TV, I knew it would be totally eviscerated. In fact, they remove so much they had to pad it out by including some alternate scenes, including footage of Sheriff Bart capturing Mongo by about half a dozen different methods not shown in the normal cut because they simply weren't as funny as "Mongo
like candy"...
BOOM!
I see there's a "high school edition" for
Avenue Q. I just don't see how it could possibly not eviscerate the entire play.