Infinitely more plausable than "some guy I know's cousin", who had the same thing happen to him. Although maybe your friend's friend and the guy I know's cousin are the same guy. We should hang out together sometime, the five of us, and talk about old times, like that time he was at the gas station, and the attendant noticed a dark figure curled up on the floor in the back seat...

My friend used to tell a story about this friend he knew who had a testicle skewered by a tomato spear. Naturally, we gave him shit because it sounded so much like one of those "Uh, not me, but I guy I know..." lines. Thank God he didn't whip it out to prove himself.