La Cage Aux Fools

S5, E21: Sarah discovers that experiments on animals are being conducted at Copeland College, but Charles does not believe her. After finding out that a professor is doing research with monkeys and losing the bet to Sarah, he and Buddy decide to lock themselves into a cage at the diner and soon, the diner is filled with students and a TV camera crew. When Charles and Buddy discover that they have no key, they are taken to the college science department where they have to spend the night. Meanwhile, the Powell children think that Charles has forgotten about his promise to take them to the movies, and they are upset.