Muffy Crosswire

Muffy Crosswire is a character from the PBS animated series Arthur.

Muffy Goes Metropolitan
In this episode, Muffy loses her left shoe while walking into a Subway Station and she hops around for a little while wearing one shoe.

A video of the action can be seen here: https://www.dailymotion.com/video/x3qibsv (Go to 23:25)