Vegeta's first death on Planet Namek! Vegeta was actually begging with tears pouring from eyes for Kakarot to avenge the Saiyan race. This was the first time that we the fans actually caught a glimpse of what was under that hard exterior Vegeta exhibits. That was for the FIRST time that I had felt for a guy who was supposedly on the bad side, it gave an insight to a whole new world that was not but seen an lived through his eyes. A selfish world that made him what he was, but still he was a shell of himself and nothing more than a puppet. lol Sorry for being over dramatic! But that was the moment Vegeta became my favorite, he became understandable.
When Freeza killed Bardock and the Planet Vegeta was blowing up while Freeza was laughing. Even Dodoria and Zarbon watched oddly. And the background music couldn't be better. I didn't cried, but this was the saddest moment, imo.
Also C16's death was very sad. His last speaking to Gohan was almost made me cry, but then Cell's speaking was funny.:D