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Shot glass boppers mounted on springs and attached to a snap-on headband, which closes rather than slides and therefore stays put through a night of movement. The bounce is the whole point; it reads from across a room and it photographs.

One headband per package makes it simple to buy exactly as many as there are people being singled out, while the 12-count case handles a whole group at once. Sold by the package (1 bopper) or by the case (12 boppers).