The Horse Ghost
Riddle: You are camping in the woods with your friends and one of them is telling the story about the horse ghost who lives in the woods who breaks people's necks when they go to sleep... but suddenly you stab your friend all the way through their heart to kill them. Why?
Answer: YOU are the horse ghost (but only secretly) and you do not want your friend to tell the story to your other friends in case they find out that you are the horse ghost. (You are too clever to break your friend's neck this time because that would be incrementing!)
Source: https://riddles.com/10411
