Innocence- like 10 times: when Angelus is all mean to Buffy when she doesn't know he's changed, when she can't kill him in the mall, and at the end when she lets the candle burn 🙁
Passion- when Giles calls Willow and Buffy and you see Buffy slide down against the wall...and then Willow starts sobbing...
Becoming Part 2 - every time i watch this i start crying from the point where Buffy hugs Angel, realising that he has returned, and the look on her face is so heartbreaking because she knows what she has to do. Needless to say, the rest of the scene is soo painful.
Season 3 doesn't have too much weepiness in it...pretty much only in The Prom when Angel breaks up with Buffy, and then again at the end of the episode. Twice. Hehe. Once when Buffy gets her Class Protector award, and then again when Giles says "Every now and then," and Buffy turns to see Angel. By the time they start dancing, i'm just a wreck!
I could go on but I don't want you all to think that all i do is cry at Buffy! It also has some really funny stuff! Hehe.
(I also cry at The Body, The Gift and Chosen.)