Don't fill it too full or you can't sit it down? But then, who'd want to sit it down!? 
This Dragon Rhyton holds 20oz of your favorite beverage and is 8 inches long from top of cup to the nose (Bottom). The opening is about 3 1/2 inches wide, from the top of the head to the handle stands about 6 1/2 inches tall when sitting up.
http://www.etsy.com/listing/85190617/snarlytooth-dragon-beer-mug
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Awesome!
EPIC!
So that's about 600 ml then? Nice!
oh, want. hey, +Bryce Hernsdorf, have you seen this?
Wow! Now that's a mug to break out for special occasions. Like, I dunno, watching Game of Thrones or something.
Very nice!
Taking that to the Ren. Fair, anyone says it's "not period" I will just whack it over the accuser's head.
Suh-weet!
You find the weirdest stuff on that thar interwebz +Scott Cramer .