It's probably one of the more embarrassing social gaffes you can make, commenting on a woman's pregnancy when she's not in fact expecting.
I still cringe when I remember offering my seat on a train to a woman I wrongly assumed to be pregnant.
Jetstar was forced to apologise to a 24-year-old passenger this week after one of its male flight attendants asked the woman how many weeks along she was. The woman, not pregnant, posted on Facebook the experience was "humiliating".
The airline has given her a $100 voucher as a goodwill gesture.
As a woman who's been overweight in the past (and is no stick figure these days) I can sympathise with her.