Anime that made you cry.

[PortalParadox]

Even after a year, Elfen Lied still haunts me...

 

[darthotaku]

in Gundam Seed when

Spoiler

flay gets killed in the next to last episode. I still cry when watching it

 

[Chiyo-Chan]

I can't remember the whole list, but I'll put up what I can think of off the top of my head.

Azumanga Daioh
Code Geass
One Piece
Monster
Full Metal Alchemist(only the original)
Pokemon

Also, I know it's not an anime, but I feel obligated to put up that episode of Futurama.