My mount in World of Warcraft has always been a goat, and when groups kept me waiting before the Dungeon Finder was added, I had a habit of hitting the spacebar so my goat would rear up and "speak".
My old raid groups learned to be on time pretty quickly!
Plus, goats are adorable!
The only problem with this is that I accidentally posted it as my mom on facebook. Then my aunt and grandma ended up watching it and were like "Huh?"