Random women I run across in public: "When are you due?" After my response, "Ohh you are so tiny," or something along those lines.
Men: No questions, just something like "Whooooa, you don't have much longer!"
A couple months back I actually had a UPS guy stop and back up a little when he was walking a package to our door. He followed that up with, "Oh man you are about to pop!" Yes, that was two MONTHS ago.
The difference with the responses & comments I get crack me up.