Here's one that amuses me. Some people ask if my boys are identical, which they are not (nor do they look it). Then this follow-up question:
How do you tell them apart?
Well, by the fact that they don't look alike.
Of course not to you - you're their mother.
Though my boys weighed exactly the same at birth and measured only 1/2" different, there is now 4 lbs. difference and 1 1/2" b/t them. So I now get this irritating comment:
(pointing at the larger boy) - He must've been born first.
[Well, he was (by 2 minutes) but that does not account for the fact that he is on a different growth curve from his brother, esp. when they weighed the same at birth.]
And my all time most hilarious encounter:
Were they born at the same time?
Yes, they are twins.
No, I mean, did they come out at the same time?
(me, with confused look on my face) Um, no. They were born two minutes apart.
Sometimes I still laugh over the idea that I would deliver two 6 1/2 lb. babies at the exact same time.