if you're trading with a cast member ...
please ASK before you start just staring at their pin lanyard. It's a little bit unnerving to have someone walk up to you and start staring at your chest. (I imagine it'd be a LOT unnerving for some of the female cast members)
also, please remember that there is a body attached to the lanyard. I've had people come up and just yank on my lanyard ... I don't particularly like being tugged around by the neck.
and lastly, please keep in mind the surroundings ... if I'm trying to push a heavy cart full of parade poles uphill through heavy traffic, that's probably not the best time to ask me if I can stop to pin trade.