Sitcoms have been a staple of the television landscape and have had us LOLing for over 70 years. But how much do you know about sitcoms from the earliest days to the most recent laughs? Well, put all those hours of TV watching to good use and see how many of these 20 sitcom questions you can answer correctly?

Sheldon Cooper’s “Bazinga!” catchphrase is one of the most popular TV catchphrases ever—but there’s a dark reason the show’s producers stopped using it in later seasons.

Robert Downey Jr is no stranger to wild antics, but you’ll never guess which bizarre prop he took from the set of Iron Man.

One of the most beloved sitcom dogs of all time actually only appeared on four episodes out of a 115-episode run.

Sometimes, bloopers end up being unanticipated treasures that actually improve a film and add an element of realness to an otherwise cut-and-dry story.

Seinfeld was one of the greatest things that has ever been on television—and we can probably all agree that none of the four main cast members have done anything as great since the series ended. But what is the best thing any of them has done, and what is the worst? That's what we are going to look at (as well as all the stuff in between).