Dollar Snatching Device (Private Sector)
This is the best dollar snatching tool you can get as a private citizen, the government has more advanced dollar-snatching equipment.
So your victim reaches for a twenty (or any bill) lying around, maybe on the ground, ZZZiiP! Suddenly, it's just GONE. This is a classic practical joke and was a common cause of having your fedora leap off your head in the 1940's.