Well, I worked as a waiter in a Japanese restaurant for a while. (BTW, I'm white. I was the only white guy there, in fact--but there weren't any Japanese either, mostly Latinos and Indonesians.) In any case, I told one of my co-workers that I'm a chemistry major; he immediately started calling me "Mr. Molecule." I'm not entirely sure he's clear on the concept of molecules; he's sidle up to me, point to, say, a bowl of sugar, and say, "Molecules, eh?"
A few weeks, later, he tried to get me to teach him to make ecstasy.
Needless to say, I've fallen in love with the name, and try to get people to call me by it whenever I can. Thus, it's my Username! It's better than my first though, anyway--chrono456192!1!!1!