At St. Andrew’s-Sewanee High School in Tennessee, the football coach attempted to jump up and chest-bump sophomore Wyatt Lindlau. The coach ended up catapulting to the ground.

A similar thing happened to Baltimore Ravens coach John Harbaugh last Thursday night. Attempting to collide with 340-pound nose tackle Haloti Ngata, Harbaugh was caught a little off guard. Check out the video above.

These coaches apparently never heard of Newton’s third law of motion: for every action, there is an equal and opposite reaction.