On this very day, May 31, in 1929 Mickey Mouse was first heard. Before that, nobody knew what he sounded like.

The first talking cartoon of Mickey Mouse, 'The Karnival Kid', is released.

During his first eight cartoon shorts, he only made noises like whistling, laughing and crying.

Mickey's first spoken words were 'Hot Dogs!' 'Hot Dogs!'

Walt Disney himself supplied the voice.