Putting your bare ass right in front of a sleeping friend then having another friend smack them and shove there face right into your ass (nose in the hole). Then you rip a huge smelly fart and/or shit while their nose is in your asshole.
If you have a big ass you could fill the victims air passages with noxious ass gass, causing them to pass out.
Extra Thrill: Do this while the victim is under covers to get a dutch oven effect!
That venus nosetrap we pulled last night was awesome! I think he's still passed out with shit up his nose!