Conversation:

It's Zaphod here. Why don't we get together? I'll meet you on the heart of gold in 5 minutes? What are the chances of that happening, eh? The more improbable it is, the more probable it will happen.

Oh Zaphod, you know that I stopped meeting you on space ships a long time ago ^-^ Besides, how do I know that you're not some crazy person?

Which head did you go out with?

Which head did you go out with?
The one with the bird cage?

Zaphod's just some guy, y'know.