Ever heard of a place... I think it's called 'Norway'?

He did say the gray building, right?

Oh Deep Thought! We have travelled long... and far. Have you calculated the ultimate question?

What's with the whole two-head thing?

He's my semi half brother.

Hey! Is this guy boring you? Why don't you come talk to me instead? I'm from a different planet. Seriously!

In the beginning, the universe was created.

Didn't you think it was strange I was trying to shake hands with a car?

Ok, leave this to me. I'm British.

So this is it. We're going to die.

Did you say the world is coming to an end? Shouldn't we all lie on the floor or put paper bags over our heads?

Vogons. They are one of the most unpleasant races in the galaxy.

-I've been talking to the main computer.
-And?

Marvin, you saved our lives!

Guys, I am just pleased as punch to inform you that there are two thermo-nuclear missiles headed this way.

The absolute worst poetry in the universe was written by Paula Nancy Millstone Jennings of Sussex.

-Let's go somewhere.
-Where did you have in mind?
-Madagascar.

All my life I've had this strange feeling that there's something big and sinister going on in the world.

-I must warn you, we're going to pass through, well, a sort of gateway thing.
-What?

You idiot! You signed the order to destroy Earth!

You may not share our intellect, which might explain your disrespect for all the natural wonders that grow around you.

-Do you know how much damage this bulldozer would sustain if I just let it roll over you?
-How much?

Best laid plans of mice and men.

Oh mighty one, we raise our noses to you blocked and unblown.

-Ford?
-Yeah?
-I think I'm a sofa.

The Hitchhiker's Guide to the Galaxy has this to say on the subject of love:

I checked The Guide for the best way to rescue a prisoner from Vogsphere.