My job at a recent open house was to take pictures. This is not a problem for me, I love taking pictures! In fact, I ended up taking about 300 or so, some candid and some posed. I tried to be discrete and out of the way, so I could get some great candid shots of guests interacting. I even wore black!
However, my camera has a pretty loud shutter so people caught on pretty quick. And I was wearing heels so you could hear me coming. But, going through the pictures, I found some pretty great expressions.