School Rumble ep. 7
Hanai-kun, trying to impress Yakumo-san, volunteers his class to clean the swimming pool (he was the class rep). The class ends up playing hockey instead, using their mops as hockey sticks and a bar of soap as puck. Nobody wins the game though since they spend most of the time chasing each other around or fighting or trying to impress the opposite sex (not that interesting of an episode, IMHO).