Ryan Potocnik, a high school senior, is a good basketball player. But for a moment, he made a very bad decision. His team, the Charlotte Christian Knights, was up 57-56 over the Norcross Blue Devils with 20 seconds left to go in a tournament in Georgia. In that time, Potocnik got the ball but started running the wrong way. Luckily, the ball was knocked out of bounds by the opponent. But unluckily, he got the ball again on the inbound and continued running the wrong way. He got to the basket and laid the ball in.
Here's how SportsGrid describes it:
Apparently, he’d been going the wrong way on the play before, but caught a break when the ball went out of bounds. His coaches never pointed out to him that he was going the wrong way, however, and after getting an inbounds pass, he laid it in on the wrong hoop. Norcross (the other team) would sink two free throws to win the game 60-57.
Now here's the heartbreaking moment (it starts at the 30-second mark):