I once knew a man with a wooden leg named Smith.
Har, har, har . . .
Seriously, we have one of these freak shows in our nice town as well. My wife always comments on him/her after we're out of earshot.
I've told he the best thing to do is to totally ignore him/her. Don't raise an eyebrow. Don't even make eye contact. Attention is what these freak shows crave. Don't give them any.