Movies- Comedy

I just had to say I'm a little disappointed that comedy's now-a-days aren't straight comedies any more. They all have to have some damn moral lesson in them. What happened to movies like Cheech and Chong used to put out. Straight comedy. The two movies I've found to be nearest this is the Broken Lizard crew's set of movies, and Super Bad. I'm sure there are a few others...but the majority have some sad, down parts. I want to watch a movie sometimes and just have it make me laugh like 95% of the time. Not 75%!! ugh...is it too much to ask?!