Crayon Shin-chan - episode 42 - 14 Mar, 1993

Shin-chan drops the pizza that Misae orders and does not tell her about it. She relishes the pizza and realises later that it was the same pizza. Masao brings a rat to school. Shin-chan frightens Yoshinaga with it, so she takes help from Matsuzaka and gets rid of it. Shin-chan gets a nightmare of a monster and wets his bed. Next morning, Shin-chan is made to dry his mattress. (Source: TVDB)