It's Always Sunny In Philadelphia: 10 Best Recurring Jokes

Always Sunny is an inherently nihilistic show that pokes fun at sentiment all the time, which is what makes the "Gruesome Twosome" of Frank and Charlie such a fun exception. These two live in an absolutely disgusting apartment, and even share a bed, yet they are so connected to each other and seem to have a fantastic relationship. One great signifier of this is their special game, Nightcrawlers.

What is Nightcrawlers? We may never fully know. All that we do know is that it's a game Frank and Charlie play where they crawl around on the floor pretending to be worms collecting minerals. What else are they supposed to do on a Friday night?

The disgust that the rest of the gang hold towards this game - without fully knowing what it is - makes it all the better, as they are fully aware of the weirdness these two share, so love to jab at it.

However, the viewers know better, as while "The Gruesome Twosome" are weird, they have a lot of fun, and thus it's always rewarding to see them reference the game they love to play together - even if it is a little strange.