He accidentally leaves Ms. Frizzle 's keys and Liz in the bathroom , and forgets to turn the water off .
Wanda and Arnold are working on a project together and somehow Wanda convinces him to go to the girls ' bathroom with her to get water .
Arnold accidentally leaves Ms. Frizzle 's keys and Liz in the bathroom , and forgets to turn the water off .
Wanda and Arnold are working on a project together and somehow Wanda convinces him to go to the girls ' bathroom with her to get water .