I think the one I really can't stand is:
"How much did you pay?"
Whaaat?

It's awkward. Makes me think they're scoping me out so they can nab my little Yorkie and run. What does it matter how much I paid? You know where craigslist.com and petfinder.com are, go find prices out for yourself . . .
I always tell them she was a gift from my boyfriend.