Star players frequently check into team hotels under aliases, the better to avoid fans, media, prank callers, etc.
One day Kevin Towers, then the San Diego general manager, needed to call Rickey Henderson. He knew Rickey used an alias on the road, but he didn't know what it was on this particular trip. So he tried to think like Rickey, and after a couple of misses, Towers figured it out.
Rickey had checked in as Richard Pryor.