[b-] Bart Simpson is in the [4] bathroom of the [-a] auditorium where a bunch of 贝 shellfish have started destroying the pipes to flood the bathroom and take it over. Bart works with the bathroom attendants to pack a bunch of 土 soil on the ground, forming a sort of 坝 dam. He then goes around with his skateboard on the other side of the makeshift 坝 dam, hitting the 贝 shellfish to stop them.