Just remembered another one. My grandmother had to have a hysterectemy during the late '60s - three years ago, in her 80s, mind, she claimed that her GP had told her she was going through "the change"...
We're not entirely sure what on earth was going on there, but as my mother and aunt - both nurses, mind - asked her how that was possible, given she'd had everything whipped out following her youngest child's birth some 40-odd years earlier... she just looked blank and changed the subject.
My father also told me a few days back about how a friend of his since they were 15 or 16, who he served in the Army with, had been a bit of a Walter Mitty character who told people he'd served with the SAS. Wore the badge and everything, even in front of his fellow retired soldiers - who all knew he was lying.
My daughter - who does have MH problems - also goes through life telling outrageous stories. Apparently she's selling scripts to film studios in LA, and was heading off there for a meeting to sell the rights to something she'd written... when actually? She was on a family holiday in Devon (I think she forgets I can access her social media accounts, at times!). She's also claimed that I've died twice to two separate bosses, and that she's been unfairly sacked from three jobs, when actually? She walked out/was fairly dismissed due to not turning up for shifts. Everyone loves her upon meeting her, all the men fancy her, she has such a hectic social life. It got so toxic that she now lives with my parents, because - and this will make me sound like a shit mother; I get that, and I agree, I probably am - I needed to protect my younger child from her lies. A few years ago, as I've written about on here before, she lied to the police about me; claimed I'd assaulted her, that I was/am an abusive parent. I was arrested and put in a cell for hours on end... until one of the officers turned up to take her statement and worked out, from my statement, that she'd lied (I admitted that she'd alleged various things about people attacking her before, and I'd been begging for help for her, from our GP, for years, who'd ignored me). But we had SS breathing down our necks for a while. And then, last year, she rang the police and alleged that my 14 year old son was assaulting me... so that was another visit, where I had to explain that she's mentally ill, my son and I'd exchanged a brief "you have homework; turn the TV off!" exchange, the PO spoke to my son, and left. She's also claimed that she's been stalked, assaulted, my ex kicked her in the stomach when she was a child (I was there; saw the exchange and know for a fact that he didn't), and a whole host of other things.
It's mental illness, these people just can't help themselves. My daughter's admitted that she feels a compulsion to tell tall tales to people... and can't understand why/how that's wrong. Maybe she's inherited it from my grandmother. Wouldn't surprise me.