What would happen to someone if they tried to climb into a grav couch just before the jump, now that they're on planet? I wasn't here beforehand but I got the impression that characters were supposed to be herded into grav couches while the ship was operable.

I'm not planning on doing anything with the info now but I know there was a hypothesis that pre-crash, passengers thought that some characters were able to get home this way, usually sort of at random. If someone wanted to test that common hypothesis would they be pasted?