I think, actually, it was partly due to the fact that I'm not really very good at figures.
6 seconds sound clip from The Hitchhiker's Guide to the Galaxy (1981) - Episode 6 sitcom.
You can hear this line at 00:20:04.120 in the Blu-ray version of the TV Series.
Quote context
[...]
- Funny, now that I come to tell this story to someone else...
- Don't you find it's a bit odd, Number Three? Yes, it is a bit odd though, isn't it? Yes, it's odd.
- Oh, I'm afraid that's a little difficult, you see.
- Our trajectory thingy was pre-set before we left Golgafrincham.
- I think, actually, it was partly due to the fact that I'm not really very good at figures.
- You mean... We're stuck here on this ship?
- When are you going to arrive at this planet you're meant to be colonizing?
- We're nearly there. Nearly there.
- Well, not exactly land, no. I think, as far as I remember, we were programmed to crash on it.
- Crash?
- Yes, there was some reason for it, but for the life of me I can't remember what it was now...
[...]
