I've thought of one that won't out me!
I'm loving most of these, the others I'm horrified at and I'm surprised you're on the internet to tell the tale. I'd have gotten my sweet revenge and been in prison
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Anyway...............me and DH (he wasn't my DH at the time, we were 21) were invited to pil's house for Sunday lunch as a good friend from overseas was there visiting. PIL don't live far, 20 mins or so by car. We got there had lunch, listened to very posh Mrs Fortesque-Smythe-Harrington-Dowton-Fevertree-Tonic-D'VonTrapp (not real name, just highlighting that she was REALLY posh, not so much a plum in her mouth, a whole fucking orchard, could barely understand her) talk for ages about life in Kenya and her safari business.
It was asked of DH by PIL if he would drive Mrs Posh to the bus station (45 mins away) so Mrs P could get the coach to wherever. DH asked what time "I must be there by 5.30." No please or thank you, you're very kind. Nothing.
"Yep no problem, we'll leave here 4.45 then."
We made it clear that we wouldn't be returning after and all was good.
At 4 we reminded Mrs P that she needs to check all her stuff was together so we can put it in the car. "Yah, yah I know."
Anyway we started making noises about leaving at 4.30 as she poured herself another cup of tea. DH was getting worried that she'll miss her coach was trying to cattle prod (as politely as possible) the woman towards saying goodbye and towards the car.
She took a fucking age, dilly dallying here and there, just checking she needed "one last nose powder" (wee, and she wasn't wearing make up, I know that because she told and said I wore too much). In fact she spent much of the afternoon putting me down (aren't your parents disappointed you didn't go to uni? You own a Staffordshire Bull Terrier, vile creatures! Your father is a solicitor, they're like vultures!! I should know I live in Keeeenyah!). Bitch.
We finally got the woman in the car at 5.10!!! As we were driving DH was being polite and having a little chit chat with her and she replied in get short one word answers. DH and I were quite confused but continued anyway. Then she shouted, actually SHOUTED!!!
"WILL YOU TWO STOP TWITTERING ON AND JUST DRIVE FASTER, I'M LATE YOU KNOW!"
I'm ashamed to say I said nothing back, I was too shocked. That woman never said thank you, offered petrol money (we wouldn't have taken), didn't say sorry or on return visits bring a token gesture of thanks.
I did however get out of the car and headed to the "loo" so I didn't have to say goodbye or make small talk with her, it was my car and petrol we used.
We've never gone to pil's when she's been there since.