Keeping players loose during the grind of training camp is a must, and Michigan State found a unique way of doing so.

The Spartans dressed up student Garrett Briningstool in full uniform and had him stand perfectly still as MSU football players strolled into the school’s football facility at 6:30 a.m. Players and coaches alike mistook Briningstool for a mannequin — until he snapped into action and gave them a jolt to start their day.

Some seemed genuinely afraid of the moving mannequin, while others — seemingly still half-asleep — barely noticed. Check out the prank for yourself in the video below.