I was at the end of a video shop while at the cashier counter of a high end retail outlet shop, when a friend loudly greeted me by name within the line. Not wanting to ignore her, I greeted her back, and mentioned that I'll come over to her after I make my purchase. After departing the store, turning off my camera, and reentering the store, I was able to have a conversation in line.
Turns out that I had a video failure while in line! The video cable may have come out slightly from the DVR, so the shop turned out to be moot anyway. I returned back to the same location a few days later. Luckily, its 4 miles away from my house.
Given the experience, this is the only time in my years of MSing that I've ever been exposed by a friend while on the job- and a video one at that!