A backboard shattering is an accident or stunt in basketball. It occurs when a player slam dunks the ball hard enough to break the 1/2" tempered safety glass of the backboard. The stunt has caused games to be canceled or delayed, serious injuries to occur, and expensive costs of cleanup and replacement.
Darryl Dawkins became famous for shattering backboards, and is credited for being the one person to cause the NBA to introduce "breakaway rims". However, on this date in 1993, Shaquille O'Neal slam-dunked the ball so hard that he broke the supports holding two backboards during games against the New Jersey Nets.
Shaq's infamous backboard-demolishing, the shot-clock-dislodging dunk was so hard he pulled down the entire backboard.
This dunk didn't even break the backboard; it made the foundation of the basket fold like an accordion. A second basket had to be brought out onto the floor while the maintenance crew attempted to fix the base of the one that was destroyed by Shaq.
As the hoop came down Shaq was lucky not to get hurt as the shot clock fell right on top of him. This one came before he took out the basket in Phoenix in the same season.
But that was Shaq. Even as a rookie, he was a force of nature. Certain athletes literally change the game.