If you work in the graphics field professionally, you have probably run into the problem where you request a logo from a client for a print job and later that day you get an email with an attached animated GIF for you to use on the company letterhead.
Or if you don't work in the graphics field and are confused when your designer tries to explain why they can't use the logo from your website for your expensive advertising, watch this video.

A great little gem from http://www.macmerc.com/