What the Hell Is That?

A tourist in a loud green Hawaiian shirt and shorts wanders onto an empty back-alley set, stops dead, and stares off camera at some unseen thing, getting more and more worked up over what it could possibly be. A second sightseer with a pocket camera joins him, and the two egg each other on, pointing, squinting and gaping in mounting disbelief. They weigh up snapping a picture beside it and briefly convince themselves they know what it is, then give up and wander off, only for both heads to pop back into frame for one last baffled look. The whole bit runs on a single question and the pair's escalating bewilderment, and the audience never learns what the thing is.