When I met DW, we both came from a dishwasher-free childhood. Indeed when I got up to do the dishes first time we ate with DWs DM and her partner, I was praised for doing it "properly, by hand".
It became a running joke, for years. DW, her sister and MiL all banging on about how they'd never have a dishwasher.
Then we went a family do at DWs sisters. Very nice. Our lad went to put a glass in the kitchen. DW said "don't forget to wash it" and he said "Oh, no need, aunty said to put it in the dishwasher". Needless to say there was a quiet pause ...
A few days later, DW was chatting to her sister, and mentioned (as you do) "How come you got a dishwasher ?". Apparently they'd had it for ages after MiL got one. And the gaslighting bitches then insisted that not only had they told DW, but they had said to me that I should buy one to help DW out. Luckily by then DW had caught them both out in lies, so no harm done.
In fact it wasn't that long after this that I discovered MNs "relationships" and was able to start to work out what the hell was going on. Although not before I was assaulted (bruises, police etc ...).
That's todays therapy ....