RC Goblin
The RC Goblin is a small remote controlled helicopter used in the missions Demolition Man in Grand Theft Auto: Vice City and New Model Army in Grand Theft Auto: San Andreas. It has no actual weapon attached to it but there is an electro-magnet attached to the bottom of the helicopter that can be used to transport objects from one place to another, like bombs. The name is a play on arse goblin, another sexual joke by Rockstar.
The only way to obtain this vehicle outside the missions is to use a trainer or modification to spawn the helicopter. The RC Goblin does not come with a magnet if simply spawned. In GTA Vice City, there is another similar but more uncontrollable remote controlled helicopter called the RC Raider.
The RC Goblin is available in Grand Theft Auto: Liberty City Stories but is never used in the game and can only be obtained through the use of trainers or modifications to spawn the helicopter.