Taking off your head and playing Bowling with it. Hehe. Would be quite fun. I remember having a dream when I was 8 about that. I got a strike on every turn with my super bowling ball lol (my head). Wierd but I was looking from my body’s view not my eyes.
I have never removed my head, but I have seen myself from 3rd person 
It sounds creepy 
most people would wake up doing this 
Now that sounds interesting. It doesn’t have to be a nasty thing with lots of blood and gore. It could be more silly, like messing around with body parts in Spore (game). With too much blood and gore, it would feel like I was some sort of phycho. But then again it can be interesting to see how insane I can be.