Personally, I've found a sense of humour to be a reasonable indication - person 2 is more likely to be able to step back, smile, and say "okay, this is horrible

Personally, I've found a sense of humour to be a reasonable indication - person 2 is more likely to be able to step back, smile, and say "okay, this is horrible and it's going to go badly for these reasons. But if I had to do it, I'd X the Y with Z". If they can do that and laugh about it, I get a sense of levity and perspective.