Amanda Troublesome is putting it mildly
I could tell a few stories but I'd be here all day. The best one though (and one that MIL will not believe happened) is when she said to me, back in 2009, after her Aunt had asked if we'd ever have children
"Don't think you're having a boy. My son is the only one to carry on the family surname, Jones*. You'll have to sort it out if you find out you're having a boy."
*Ok our surname isn't Jones but you get my drift.
If that wasn't bad enough, she's not even a Jones. She's a Smith. She changed her name by deed poll to Jones so her son is technically a Smith, not a "real" Jones. Not that any of that matters, it's just her attitude which riles me.
She is not going to be pleased to find out I'm pregnant. Neither will my BILs wife - another woman with a screw loose. The best story there?
She was planning their wedding abroad, came up to me one day and showed me her guest list. At the time, DH and I were living together and had been for a few months. Her list was as follows:
MIL & FIL
Mum & Dad
Cousin & partner
Hazel's DH & ?
SERIOUSLY. In the end, no one went to their wedding but how rude?! This was the same day she called his ex wife in front of me and told her how much she missed her and she wished they'd never split up.
It really annoys me when everyone says "Oh she's lovely!" They haven't been on the end of her attacks. 2 years ago she sat in my garden and told me I would never be good enough for DH, no one in the family liked me, they all wish he'd never split up with his ex wife, he would never want children with me and the family were hoping we'd split up soon so he could find someone to be happy with. I know she doesn't like me and I know my BIL isn't keen on me either but surely they could tolerate me a bit more? and not be so effing rude especially when in my house
Anyway, I'm expected to tell them all Saturday night and I just don't want to as I know it'll make the evening even more awkward. Plus, my scan isn't until Monday. I have said to DH that if he wants to tell them Saturday, then he'd better pay for me to have another private scan this week.
That's made him think twice about telling them 
Sorry for the rant there, it's all been bothering me a bit recently and I really don't want to see any of them Saturday
Thankfully, my FILs side are super.