1. Get friend drunk/stoned.
2. Tie their hands in front of them.
3. Peel down their pants at the back just enough so their crack is showing.
4. Insert a small strip of toilet paper into the victim...i mean, friend's brown baby boy button.
5. Set fire to aforementioned TP and, since their hands are tied up so they cant reach back to put it out, they run around for a while like a chicken.
6. Watch and chuckle. Filming the ordeal is good blackmail.
"It's okay, let's make a chicken run!"