A mother thought she was outsmarting her son by tricking him into doing the 'get that money' challenge.br br The mother commented: "[Other kids} were smacking their heads off the wall. No shame, I thought it was HILARIOUS."br br The 'get that money challenge' involves dropping a credit card down a wall or door and another tries to catch the falling card with their head.br br They tried the game on June 1 at their home in Lockport, Illinois.br br The boy ended up buying a space Lego set with his winnings.