“Artists who cleverly use participatory moments can make bold statements about the boundaries between performer and spectator, onstage and off. … But all the experiences I’ve loved have had something in common: They’ve given audiences a choice. A few weeks back, I had a starkly different experience.” Lauren Wingenroth describes what went wrong with that experience (Boris Charmatz’s 10000 Gestures, if you want to know), and suggests one simple step performers could take to avoid crossing the line from challenging to obnoxious or worse.