The Cavaliers played the Magic on Sunday in Orlando, so LeBron and crew were already dealing with being in hostile territory. During the 4th quarter, James tried to save a loose ball from going out of bounds, but a fan decided they were just going to slap the ball out of his hands.
The refs at first missed it, but after reviewing the play, the fan was called for interference. The Cavs were awarded the ball, and all was as it should be. The fan appeared to have attempted to apologize to James. Not sure how LeBron felt about that apology.
[h/t Bleacher Report]