What has been your biggest "what just happened/what's gonna happen" moment?

[Claraviolet]

There is no such moment for me.
I think it's because I don't have any favourites. Is it the same for you guys? Or do you have any such moment?

 

[Demon_Skeith]

any animes that end on a cliffhanger of someone suddenly being killed or back stabbed out of nowhere. I can't think of their names right now.