Change one thing in an anime's starting episode which would completely change the entire rest of the series. The smaller the better.
Starting with the obvious one:
Index lands on a different balcony.
>Kite doesn't visit Whale Island
>Gon either gets killed by the Foxbear mother or never becomes a hunter
>mfw without Gon, Kurapika and Leorio would die in the Hunter Exam. Killua would probably kill one of them.
>His sister dies in an airplane crash, the break up never happens and they marry afterward.
>Shinji get's his own room at NERV HQ
I've said this for ten years.
>shinji and misato die in their car accident
>rei is rejected by eva-01
>the angels take over the world
>series is about a group of militant third impact survivors at the Nevada base as they attempt to reactivate Eva-03 and Eva-04
>they succeed and even kill some of the angels but end up overwhelmed and all die