- What are you doing here?
- Same as you.
- I hitched a lift.

4 seconds sound clip from The Hitchhiker's Guide to the Galaxy (1981) - Episode 2 sitcom.

You can hear this line at 00:33:35.564 in the Blu-ray version of the TV Series.

Quote context

[...]

- Well, of course, he only had the two arms and the one head, and called himself 'Phil,' but...

- But, you must admit, he did turn out to be from a different planet.

- Good heavens! Tricia McMillan!

- Trillian, to you.

- Infinity minus one. Improbability sum now complete.

- For my next trick...

- Shut up.

- What are you doing here?

- Same as you.

- I hitched a lift.

- After all, with a degree in maths, and another in astrophysics, it was either that, or back to the dole queue on Monday.

- Oh, God. Ford, this is Trillian. Hi.

- This is my semi-cousin, Ford, who shares three of the same mothers with me. Hi.

- Is this sort of thing going to happen every time we use the Infinite Improbability Drive?

- Very probably, I'm afraid.

[...]