Joke theft is a serious crime. It's on the same level as art theft, except at least with art theft the thief gets to wear one of those cool black cat suits. It always irks me when I see someone post a joke I've read or heard before, portraying it as their own work. Unlike with internet pictures which make it easy to prove theft, the person can always fall back on the old coincidence defense. That's not so true when the joke is from one of America's biggest comedians, on five nights a week.
This guy thought he was slick recounting a fun little exchange between himself and his barber, but his friend must have known that he isn't that funny because he quickly links to a picture of a Jimmy Kimmel interview with Robert Downey Jr. using the exact same joke. Busted.