Betty hangs around with Carol and me most of the time, but occasionally she disappears. When she vanishes, there is a high probability that she has discovered a forbidden object (FO) and is secretly playing with it. If we don’t notice that Betty is not around and don’t search for her right away, then the danger is that the FO will become a UFO (unidentified forbidden object). So don’t tell me that UFOs don’t exist because I’ve seen plenty.