All pro tight end Rob Gronkowski had a little fun when he crank called star QB Tom Brady.

Gronk called Brady on video chat, then tells the GOAT "I'm busy right now" and acts like Tom Brady called him.

Tom Brady looks a little puzzled and starts laughing about it.

Tom Brady picked apart the Chiefs defense but almost got confused by Gronk's hilarious prank phone call.

Gronk called his Dad next and did the same thing.