If the age of Judd Apatow shooting enough improv for a franchise large enough to dwarf the Marvel Cinematic Universe, we all know comedies don't just happen. Doesn't matter how chill and easy the actors make it look on screen, making comedies is hard work. Just ask anyone who's ever bombed at your local open mic. Not to mention comedy rarely stands the test of time (remember how people overlooked how creepy Wedding Crashers was for a summer?) But sometimes, sheer dumb luck can strike, and you've got immediate comedy gold.

If you ever think you need a huge amount of money to get a show made in Hollywood just look at It's Always Sunny in Philadelphia. The pilot for the show only cost $100 and it went on to become the longest-running live-action comedy series in American television history. More about that and 28 other behind-the-scenes tidbits from beloved comedy movies and shows:

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