At an improbability level of 8767728 to 7 against.
8 seconds sound clip from The Hitchhiker's Guide to the Galaxy (1981) - Episode 3 sitcom.
You can hear this line at 00:11:59.244 in the Blu-ray version of the TV Series.
Quote context
[...]
- I said, does anybody have a good reason for not using the Improbab...
- Hey! What the photon happened?
- Well, I was saying, there's this switch here, you see.
- Well, exactly where we were, I think.
- At an improbability level of 8767728 to 7 against.
- Hey! Did you think of that, Earthman?
- That's a pretty hoopy piece of thinking, you know that?
- Well, it was nothing, really.
- Was it?
- Okay, computer, take us in to land.
- Well, I mean, I say it was nothing, but obviously it was something.
[...]