Hah! So he's alive. That poor fool. It would've been a lot less painful for him if he had just rolled over and died. My Majin Buu is invincible. And now he's going to eat them all up! Ha ha ha ha ha ha ha ha ha!
Huh? Who are you? Heh...my what a lovely shade of green you are. Looking good. Who could blame you. After all, you've seen the power of Majin Buu. It figures you'd turn green with envy.
Trunks, there's something you must know. You've made me proud, my son. [Vegeta swipes Trunks' neck, knocking him out in order to prevent him from attacking Buu]
Uh!? What did you do to him!? Why'd you do that!? What's wrong with you!? Why did you do that to Trunks? You might've killed him. Why? Are you crazy? Why? Why did you do it? Tell me! Why did you do that to Trunks? You're his dad! Dads aren't supposed to do bad things to their sons. Why did you hit him!? Why did you hurt him like that? Why? Why? [Vegeta punches Goten in the gut, also knocking him out] Uh...
I'm not going to lie to you, Vegeta. Although the answer may be difficult for you to hear. This is the truth. Goku devoted his life to protecting the lives of others. Because of his selflessness...when he died...he was allowed to keep his body...and travel to King Kai's planet. You, on the other hand, have spent your life in pursuit of your own selfish desires. You've caused too much pain. When you die, you will not receive the same reward.
[to himself] Trunks, Bulma...I do this for you. And yes, even for you Kakarot! [Vegeta erupts with rage, exploding and killing himself in order to obliterate Majin Buu]