>>42480944 (OP)
Ticket Master by immediately rehashing the previous badly written episode. I still trucked on out of curiosity but I got bored after RoH, I thought the show was just okay and that s2 would be its last.
I gave the show another try after it ended because learning it lasted 9 seasons surprised me and then I ended up really enjoying the show, even the first season went far better than my first impression somehow. The middle seasons were amazing though, s4-7 was the most fun I've had in a cartoon.
Then I boot up s8, huh who are all these characters what the fuck is going on. Right then I knew things were going to shit the bed. I look it up and learn I have to watch a movie. Being forced to watch something outside of the show for context is a big big BIG no-no, clear corporate exec meddling. Then the movie was shit although Tempest was cute. I still like the final seasons though, but I think my love for the characters is carrying it and I find some of the creatures cute so they don't offend me like it does to others.
So Ticket Master (false positive) and The Movie (the true harbinger).