I've spent the past few days in our Singapore office. It was the source of my only, and therefore best, come back to someone's comment about me being pregnant.
I walked over to the desk of a colleague who didn't know I was pregnant, D (male).
Me: Hello D
D: (pointing to my large belly) Fuck
Me: Yes, that's what got me into this state
OK, so it's not really all that funny. But I was quite impressed with my quick retort.