When I finish a film, I like to drastically change my appearance. I get sick of looking at the same thing in the mirror for months at a time. So when a film's over, I'll do something like shave my head.
I'm one of those people who when I go over a bridge, I want to jump. It's just this intense tickle in the back of my throat. It's like I'm on the verge the whole time I'm walking over that bridge, and I'm not going to get a release until I jump.
The question I should have asked is not what is the rule, but what is the principle.