I almost got kicked out of a group.
I organized a new group of Players and started a campaign (me as DM). The second game session ended in a TPK, mostly because of the intentional mechinations of one Player. When I showed frustration and disappointment at how my campaign had started and ended, that Player offered to DM his own campaign.
I didn't realize at the time that the TPK was the responsibility of that Player, but soon after, it became apparent in hindsight. Actually obvious.
We played in his campaign for several sessions, and the Player/DM proved to be on an ego trip. *All* his NPCs were either badasses, much better than the PCs, or just simply disrepectful to the PCs at every opportunity. We PCs were completely outgunned, outclassed, and outnumbered in all our endeavors. Every NPC had more attitude than a 15-year-old girl---even those who were supposed to be "on our side". We were never allowed to do anything but fail. And every failure was all our own fault, according to the DM.
One time when an NPC (a frickin wagon driver) rudely blew my character off for suggesting that one of us PCs ride up front with him, I lost it. I bitched loudly. The aggravation had built up so much that I just exploded. The DM said if I didn't like the campaign, I could leave. [We were playing at his home.]
Since I had organized and started that group, just a couple months earlier, I backed down that night. I didn't want to just walk out on my hard work and give it freely to him. Two weeks later, I was DMing my own game with 2 of the other 3 Players from that original game, plus 2 more new Players. And the only reason I didn't offer to bring over that 3rd original Player was because he had joined the Army, and was reporting for duty in two weeks.
Quasqueton