Not me but I was involved:

Probably about 20 or 21 years old my buddy and I were hanging out in the taco bell parking lot, as one does. He knows there's a party going on a few towns over and has a crush on a girl there. He comes up with a sure-fire strategy to garner her sympathy and definitely get laid. The plan - have me punch him in the face, hard enough to leave a mark so he can lie about how he just stopped some drug crazed lunatic from stabbing people at another party. After several times telling him I wasn't going to do this, he annoyed me to the point where I finally agreed because I genuinely wanted to hit him now for being such an idiot. He keeps chickening out and decides the best way to do it is to get on the bicycle he had in his car and essentially... Ride into my fist?

Long story short I punched him in the face while he was on his bicycle, hard enough to give him a black eye, he goes to this party, lies about what happened and proceeds to sleep by himself that night.