I take my mad 92 year old gran out for lunch once a week. From her I have repeatedly had "So do you have an actual date yet?" NO you don't get a bloody "actual date", you get a 4-5 week window, do you not actually have kids? (I would LOVE an "actual date").
She is also obsessed with what happens if I should go into labour when we're out - she seems to think that it will all happen in about five minutes and keeps telling me that she doesn't know how to deliver a baby. This is a disturbing enough thought in itself, but she also keeps suggesting she'll have to "bite through the umbilical cord". Because that's a mental image I want, thanks. I work with my brother and the other day she suggested that he might have to deliver it. Again, not really something I want to have to think about.
She's also offered to drive me should I go into labour when we're out together (though she really thinks I should stay home for the whole of the 4-5 week window she doesn't believe in). Um let's see - you're 92, mad, haven't driven for years, don't have a licence, and, as you keep telling me, blind. So actually I think I'll take my chances with me behind the wheel.
Neither of my grannies can get their heads around my home birth plans, despite both of them um having children at home. Mad granny asked me whether I only get to have a hb if I go into labour while I'm at home.
Can't remember what else. She is obsessed with finding out the name we've picked and keeps asking DD, the sneaky cah. Luckily DD (a) doesn't know and (b) is obsessed with her baby brother being a frog so will only tell mad granny that he is called Frog.
Disclaimer: she is not a nice sweet old lady, she is a manipulative harridan and I am very pregnant and angry today 
One of the worst I heard was my aunt to my SIL shortly after my SIL had found out that she was both unexpectedly pg and three months along. She and my brother had recently bought a house they were doing up so they'd be doing loads of DIY with various exciting chemicals involved. Aunt said "Oh yes, I did loads of DIY when I was pg with DD2, I've always thought that was probably why she was premature and we had all the problems with her birth." Nice!