The re-entry corridor is, in fact, so narrow that if this basketball were the Earth and this softball were the moon, and the two were placed 14 feet apart, the crew would have to hit a target no thicker than this piece of paper.
15 seconds sound clip from the Apollo 13 movie soundboard.
You can hear this line at 01:40:12 in the Blu-ray version of the movie.
Quote context
[...]
- Can they fly it manually and still shut it down on time without the computer?
- I guess that's the best we can do. We're out of time.
- If they're too steep, they'll incinerate in the steadily thickening air.
- If they're too shallow, they'll ricochet off the atmosphere like a rock skipping off a pond.
- Okay, people, on your toes. We're doing this one blind.
- Look, it will ignite, will it not?
- I just want you to know the engine's never been tried like this. That's all I'm trying to tell you.
- I know what you're trying to do. I guarantee I won't hold you personally responsible.
[...]