Gainax Ending
An anime that makes you think you're in for a good time, only to drop a bomb on you and make you question your whole life.
I was ready for a happy ending, but instead, they just left me hanging. Like, 'See ya!' and walked away.
I felt like I was about to win the lottery, and then they told me I lost the ticket.
They made me love a character, then just ripped them out of my life like they were never there.