I don't know if you have noticed, but LeBron James is always biting his nails. That's pretty sick, during a game he bites them, cameras zoomed in on him, and millions of little kids looking at him..It just looks weird, that's probably the only star I have seen do something dumb like that on a dead ball. Normal cats just chew their gum, this guy is chewing something else.
There is a thread on this in the Cavaliers forum. Everybody has noticed this and we have decided it is because of the stress/pressure that he is under.