Well the cupping fart thing I got from a Korean comedy skit I saw many years ago.
IT was this commando raid on a North Korean base. They had to find a way to kill the guard, but they couldn't use their guns (cause it would be loud) and they didn't have silencers. So one dude pulls out this HUGE Rambo knife.
But then, the leader jumps in and says, wait, "I have a better idea!" Puts his hand to his ass, pulls a silent but deadly, and cups his hand in front of the guard, who dies instantly.
So then they get to another guy, and the dude that had the Rambo knife says, "Boss, he's mine" Puts his hand to his ass, and RIPS A f-ing MEGATON FART. Then they have this graphic of North Korea going up in a big mushroom cloud.
I thought that was hilarious.