expecting of hanover

Overheard conversation in the pub today:

Man in stripey jumper, spotting a friend with a toddler arrive at the bar: Oh hello, how's it going?
Man with toddler: Oh, good, thanks - lovely weather. Have you met my youngest?
Man in stripey jumper: No, hello. I've got two of my own coming shortly.
Man with toddler: No, really!? Congratulations. Two, you say?
Stripey jumper: Yes. Due in about sixteen weeks.
Toddler man: Gosh. Twins?
Stripey jumper: No. (beat) Different mothers.

He was joking of course, and several people at the bar laughed. Good stuff.