In Monster's Inc, Mike and Sully encounter The Abominable Snowman, who apparently takes offense to that name.
Abominable. Can you believe that? Do I look abominable to you? Why can't they call me the Adorable Snowman, or the Agreeable Snowman, for crying out loud? I'm a nice guy.
The IMDB page lists the character as being called "The Abominable Snowman", but the dialog indicates that he has another name.
Has his real name ever been revealed?