(Just out of curiosity...)
(Psuedo-PEdit: OK, so that works.)
(Psuedo-PEdit 2: Wait does this mean I can keep doing Preview until I get a good roll?)
(Edit: OK, so it appears that preview re-rolls but it will re-roll again when you actually submit it.)
(Edit 2: OK, so if you edit an existing post it does the static thing.)
(Edit 3: This is getting ridiculous)