I'll tell you what. Seeing as how your power levels are more or less equal, why don't we make a little game out of this? We'll call it "which of you can last against me the longest?" The rules are simple. I cause you both a great deal of pain and you writhe around in agony. The loser is the first to beg for mercy.
[after he burns off Piccolo's arm with a blast] Aha ha ha ha ha ha ha ha! Oh, excuse me! Has anyone seen my arm? Aha ha ha ha ha ha ha ha! You can't miss it! It's green! Aha ha ha ha ha ha ha ha ha! AH HA HA HA HA HA HA!
[about his Special Beam Cannon] Well, the truth is, its untested. I've never tried it against an opponent. I was hoping to save it for a special occasion. It's the attack I planned to use to defeat you.
[after the armor pad is pierced] My that was quite an impressive little trick. Look how easy it pierced my armor. It's lucky for me that your aim needs some work.
Just say "uncle!" Heh heh heh heh heh heh. Uncle! Ha ha ha ha. [to Piccolo] Just look at that fool! Why so blue, green man? Is it because you're powerless to help your friend, or 'cause you're just plain ugly!?