Weekend at Benson's

S1, E6: Mordecai and Rigby are trying to help Benson fix a street light, but start fighting and Benson falls off the ladder and gets knocked unconscious. They put sunglasses on Benson attempt to take him home so they won't get in trouble for knocking him out, nearly getting busted by a persistent Muscle Man who wants to thank Benson for helping him with a date.