Goku, this will be the last day of your training with me. You've done well, but I'm afraid you're lacking in one area. You still can't seem to deliver a good joke when the pressure's on.
Ahh! Oh no!
W...what? What's wrong?
I forgot to include in my calculations the time it's going to take you to get back to Earth on Snake Way.
What?! But King Kai, I thought that you were just going to zap me back to Earth. What? You gotta be kidding me right? It took me nearly a year to get here you know.
Yes, but um...uh...after your training you'll be much faster. You should be able to make it back on Snake Way within two days if you go all out.
No! But that means I'll get there a day late. It'll all be over by then! I can't do that!
That's enough Goku! I'm not perfect, now am I? Even I make mistakes.
[after Piccolo blasts him with his eyes] Hey, you cheated. You said no eye lasers.
And what if I did? You should never believe anything the enemy tells you!
Yeah, but I mean, you're not the enemy.
SShenron
Why have you summoned me? Tell me your wish now.
Yes, uh, excuse me. Mr. Dragon, could you possibly destroy the Saiyans that are on their way to Earth right about now?
Hey, Oolong! That's not the wish! What about Goku, you little pig!
What? We could wish Goku back but why not wish him back next time and have the dragon save the world now?
SShenron
Your wish cannot be granted because the guardian of Earth created me. I cannot grant a wish that exceed's his power.
That Goku truly does have some incredible powers. Not only that, but his heart is as pure as gold. It's hard to believe that he was living down on Earth.
He's stronger than you now, isn't he King Kai?
Uhum...hmm...well, he has surpassed me in every area except one. I am still the funniest man in the universe.
These quotes come from Wikiquote's Dragon Ball Z pages and are available under the Creative Commons Attribution-ShareAlike License.