This is what happens sometimes at my job. I help them in the electronics dept. then ask them if they need any more help. They say no, that they are going to look at the knives at the counter in sporting goods next. As they are walking to there from one direction, then I circle around to stand behind the sporting goods counter, and then they arrive. They see me and do a double-take. "Wait a sec. You just helped me in electronics. How did you get here before me?". LoL! :)