MIL. Oh the stuff she will complain LOUDLY about make me run and hide round a corner with embarrassment.
At an arcade she spent a good £15/£20 putting 10ps into a coin dozer (the moving shelf) game. She walked off to get more coins (without getting one of our group to take her place) and a random family came along and started playing. They managed to get all the prizes MIL has brought forward. Fair enough. That's the whole way the game is played.
MIL stormed off and went crazy at a staff member about "that fat bloody family took my prizes! £20 I put in there!!! It was me who got them all to the front!". The poor chap didn't know what to do so he handed her a handful of the prizes from his restocking basket and ran.
Another MIL one. We turned up for a family visit on a Saturday (as requested) along with BIL and SIL where we would usually order in a big takeaway, (our treat) and either I, BIL or SIL would do the dishes so MIL didn't have to lift a finger.
It was a warm summer night and MIL announced we were to go for a meal at a big restaurant nearby. Great. I asked what time it was booked for and she told me it was fine, we'll go at 7pm. I offered to phone them and book in as we would total 11 people and it would be a very busy Saturday night, MIL made out that it was all sorted.
We got there and it was heaving (as expected). MIL gave the host HELL when he apologised, telling us there was absolutely no way he could fit a table of 11 in and it was, of course, booking only. He said he might be able to do three smaller tables over the next hour or two but that would be pushing it. MIL would not accept that there wasn't a big table for us at no notice and told him to "push those free tables together then!". He explained that the tables were situated all over the restaurant MIL told him he needed to move the other diners (eating at the time) then.
DH and I slunk out the door while MIL got a bit foot stompy and loud.
Our takeaway that night was delicious as usual.