I meant what I said about PMing everyone Jester as their role just to see what would happen.
Last weekend I played Mafia IRL with a bunch of friends, assigning roles using playing cards. We'd already played a few games. Several players were a bit miffed because they still hadn't gotten anything other than Vanilla Townie and they ended up swapping cards with each other, seeing they were all VT. Of course that's not fair to other players, so we would redeal. And the same thing would happen again. We redealt something like 5 times. Others started getting fed up so they finally settled down and accepted their role. That game was particularly bad for the town. Everyone who died came up VT. They didn't realize until the very end that I had dealt everyone VT cards.
The best part was how confused one guy was after he'd gotten lynched. It was night phase and he was looking around trying to find the Mafia (and other roles) as I called out to them. It took him far longer than should have been necessary to realize I was just making it up.
This is an experiment that I think every group of regular mafia players runs eventually. I remember when we did it with my friends. I was unaware (only the moderator knew, of course), and I died during the gamr. The moderator told me after I was dead.
Eventually, there were 3 people left. They were utterly, utterly, furiously confused. They took forever to decide who to lynch. They just had no idea. When they found out, they were beside themselves with anger.
Anyway, this solidified in my mind that somehow, members of the mafia do give themselves away. Because in this game, with actually no mafia, the all-town group actually did have a noticeably harder time deciding who to kill.