John has summoned Mr. Boswell, Stanley's dad, to account for his son's continuous absence to class for five days. Boswell explains that the boy is afraid of crossing in front of the Crabtree mansion, an abandoned house that neighbors believe it to be haunted. John decides to find out who's behind the Crabtree ghost.

It is vaccination day at the school and John turns into a kid and he gets vaccinated. Then at the end of the episode, he becomes a man and the other teachers take him to get vaccinated again, much to his chagrin.

John believes he has discovered the secret of the Fountain of Youth, so he calls a press conference to announce his discovery — but his "discovery" shows no signs of panning out as he had believed.