Harry thought the only tattoos he was likely to see in the Wizarding World were the Dark Mark. So when a man walked by with a dragon tattoo that breathed fire, Harry had to ask about it.
Draco Dormiens Nunquim Titillandus: The Hogwarts motto. Translated, it means "Never tickle a sleeping dragon." How exactly did they get a motto like that? Well, maybe the founders got up to some interesting shenanigans... One-shot, Rated K for slight language