waititi:

“Korg introduces himself with a rock-paper-scissors

joke when he first meets Thor, then goes on to explain to Thor how he tried to start a revolution but failed because he didn’t print enough pamphlets: paper beat rock.

And at the end of the film, we see that Korg has accidentally crushed his blade-armed alien gladiator friend, thinking he killed him. Though the alien wakes up, the joke there probably sailed over everyone’s head: rock beat scissors.”
– Five Hidden Jokes You Probably Missed in Thor: Ragnarok