The beloved Star Trek: The Next Generation episode The Game has Riker introduced by a Ktarian woman to a wearable holographic game in which the player mentally maneuvers floating discs into wiggly tubes.
Quickly the whole crew of the Enterprise is entranced by the game, which they are strongly compelled to distribute to others. It is later discovered to be highly addictive and to manipulate the wearer into a suggestible state, submitting to the will of the Ktarians.
Not a violent weapon, but devious.
See also: Mass Mind Control