"Ozzie and Harriet" did 434 episodes. "It's Always Sunny" is at 127. It's total BS to claim it's the longest running without qualifying it. "Ozzie and Harriet" would've been on until 1996 at that rate, or (more satisfyingly) "Cheers" until 2009. And of course "Sunny" is on cable so can have a smaller niche…