Bug: Sometimes when a player wearing an Unusual hat leaves the server, the effect of the Unusual will stay hovering in the air where they last were and will stay there until the server resets. It will only be visible to some players though. For example, a player has on an Unusual hat with the Orbiting Planets effect. They leave the server and another player goes to the spot where they last were and can see just random miniature planets circling around in a spot levitating above the ground at about eye level.
Trivia: Originally, the Short Circuit was designed more as a minigun like weapon that opened up from the Engineer's glove. However, Valve decided to they wanted a less powerful electric based weapon, so the current design is what it was changed to.