Might be a little weird to do it cold, but if you want to get bold you could try to buy coins from random people. Just be like "I need some bitcoins, do you know anyone?". You'll get like 100% nos of course, but you'll up exposure and it's just odd enough an interaction you'll probably get a solid % googling it later. And it'll help them understand right away that bitcoin isn't a MtGox(tm) product, you can buy it from your peers on the street.