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The group wasn't a regular group of mine, I was a guest GM! A couple of years ago, that was something I really wanted to do. I like running one-shots and dropping in on other groups is a great way to do this while giving the regular GM a break from their role.
I played Poison'd. 'nuff said.
Channeling my inner Nittner, I used props, mostly to create a sense of place. I had a wooden chest filled with my gaming dice (mostly gem finish) and Campaign Coins, left open on the table. There was a small whiteboard flat on the table for dice rolling, notes and Cruel Fortunes. I placed a flintlock-esque pistol and a parrying dagger on either border of the whiteboard. At one point, just about everybody picked one of them up to toy with. I even used the pistol as a pointer when asking, "And what are you doing about that?"
All good. All happy. Wishes granted.