I've never been fired by a band and I don't have any juicy stories, sorry.
My first band was disbanded by the guitarist - it was his and the singer's band to be fair but it was a rather jarring experience. Band get together in the pub - oh good, this is nice. Guitarist gets there last, not sure if he even sat down (memory blur) and just told us he didn't want to do it any more (I can't even remember how he said it - I want to say "band had run its course" or something), cashed us out of the band kitty (or did he do that later?) then left, leaving a table of a bass player, drummer and singer just kinda looking at each other thinking "what now?". We tried to form something out of the ashes but it didn't go anywhere.
See how hazy it gets when the dust settles and you've done a bit more living?
I left another band in solidarity with my drummer who got sacked. I didn't like how the sacking was done (when I was on holiday in Spain, no band meeting, no discussion), I wasn't that keen on where the music was going either and there were no upcoming gigs in the calendar so it was a clean getaway. They're still going.