Vibro-Dagger
From AmtWiki
A dagger constructed in the mid 90s by Roger Shrubstaff using what he swears was an electric toothbrush for a core. Regardless of what it was, it had a switch on the grip which caused it to vibrate when set on. This was used to claim a large number of rapid hits, as if it could cut through any amount of armor in seconds. Despite his swearing it was an Electric Toothbrush, many continued to assume it was some other type of battery-powered device.
Eventually the device, which was meant to be recharged on an electric toothbrush stand, ran out of power and was retired.