This turned up on the Blob's radar a tad late, but apparently Celtics guard Rajon Rondo got in trouble last week for ... wait for it ... wearing his headband upside down.
According to the league office, this now violates the updated NBA dress code, which apparently exists primarily to give wannabe grade-school principals something to do when they're not hunting down Ferris Bueller. The new rule forbids players from wearing headbands -- which bear the NBA logo -- in any manner that displays said logo upside down.
"And no chewing gum in class, either!" decreed the Big Schoolmarm, NBA commissioner David Stern, smacking his desktop menacingly with his ruler.
(OK, so I made that up. But, seriously, people. You're a professional sports organization. Can you at least attempt to behave like one?).