The Weird West
A small, palm-sized, silver globe
This small, palm-sized, silver globe opens when certain panels are pressed in the right order and emits a flash of green light in a 90 degree arc. Everyone withing the arc who fails to resist the device suffers short-term memory loss and are incredibly susceptible to suggestion for about 10 seconds.
The mnemomizer is one-use only and if activated improperly, blinds everyone in the vicinity.