SPOILERS
1.) When Fred died.
2.) "We'll join you when hell freezes over! Dumbledore's army!"
3.) When Ron left.
4.) What Ron saw in the locket.
5.) The Prince's Tale.

I cry at everything :/
1. When Sirius gave Harry the Hogsmeade permission slip in PoA (don't judge ROFL)
2. Cedric's death
3. Sirius' death
4. Dumbledore's death
5. Dudley and Harry settling differences in DH
6. Hedwig's death
7. "Dobby has no masters. Dobby is a free elf"/death
8. When McGonogal (sp?) was rounding up all the statues to fight
9. Courtyard Apocalypse (film)
10. Prince's Tale
11. Harry's death
12. 19 Years Later

Prince's Tale.
There are so many. I cant name all of them. This was on top of the list!

The time I cried hardest was when Snape died... He is my love <3

When Bellatrix died.