Crayon Shin-chan - episode 23 - 18 Oct, 1992

Shin-chan decides a code for him and his mother as she goes out. Shin-chan makes the courier man utter the code and pesters him. Yoshinaga brings stilts for the kids to play. Kawamura and Kazama give up, but Shin-chan continues performing stunts on the stilts. Shin-chan and Misae go to the station to pick Hiroshi as he doesn't have an umbrella. They decide to get drenched and enjoy the showers. (Source: Wikipedia)