It's just a rhythm thing if you're going to set something up like that. You make
sure it's a set-up: you state it, restate it, then pay it off. That's really
what it is. And then it's just a feeling, if he's slipped once and then slipped
again it wouldn't feel right but if you make a habit of slipping on the stairs ...
- Kevin Conroy Scott - Screenwriters' Masterclass