What are the most tear jerking/ sad anime have you watched?

[Einzo]

I personally think that these anime are the most tear jerking and sad for me:

1. Anohana: The flower we saw that day
2. Clannad
3. Air
4. Elfen Lied
5. Tokyo Magnitude 8.0
6. Da Capo
7. Angel Beats
8. Grave of the Fireflies

May have more but could not remember them.

[Konoka]

Hmmm my list is quite similar to yours, Einzo.  But well, in no particular order:

1. AnoHana (I also found the ED to be quite a tear jerker)
2. Clannad
3. Angel Beats
4. Hitohira
5. Tasogare Otome X Amnesia
6. Ef - A Tale of Memories
7. Tokimeki Memorial - Only Love

AAAANDDD
8. Danshi Koukousei no Nichijou (I cried from laughing WAY too hard)

But meh, list isn't too long, because I'm not a big fan of tear-jerkers. I much rather prefer comedy. Like Danshi Koukousei no Nichijou 

[Einzo]

Maybe you can start a topic on light hearted/ comedy anime!

[phyllisgal]

I only can think of one touching named Saikano (最終兵器彼女, Saishū Heiki Kanojo）