It was part anger and part bad luck.

A Pennsylvania father approached the plexiglass at his kids’ hockey game, slapped it to express his displeasure with the referees, and it shattered.

ABC News 4 reports:

As one of the players falls on the ice, a man in the stands yells at the referees and slaps the glass. The titanium wedding ring on his finger connected just right — and shattered the glass.

In the video, the parent can been seen leaning through the empty hole where the glass once was, pointing and shouting expletives are the referees.

“That kind of acting at a game is just not tolerated at all,” Mike Cleveland, the general manager at the York Ice Arena, says.

Plexiglass is designed to withstand 100-mile-an-hour slap shots but does on occasion break. Obviously.

The father was told to leave the arena, which he did.

He’s reportedly agreed to pay $500 for a new piece of plexiglass.

“Youth sports needs to be what it is, and that’s an outlet for these kids who have a lot of stresses on their lives,” Cleveland says. “It’s just a game.”

The news station cites another parent the father’s child was asked to quit the team.