Something or someone must have really ticked off this Grizzly Bear.

Daily Mail – A grizzly bear exhibit at the Minnesota Zoo is temporarily closed after one of the three bears in the enclosure picked up a basketball-sized rock and shattered a barrier.

Startled visitors stood on the other side of the barrier as the bear repeatedly slammed the rock into a pane of glass at the zoo in Apple Valley on Monday morning.

The five-layer pane stayed in place ‘like a windshield’ and no one was hurt, zoo animal collections manager Tony Fisher told the Minneapolis Star Tribune.

Read more: Daily Mail