Do you have a boyfriend?
I was at a party and some guy who'd been following me around all night dropped that one. Naturally, I tried my best not to laugh in his face (with limited success) and proceeded to tell everyone in the vicinity.

No way! You're too hot to be a doctor...
*Ugh* Yes, you told me that because of my *appearance* you will never respect me as a doctor. I think now's a good time to take off my pants.