As Scarface showed us, a chainsaw can be pretty useful in and of itself. It's fairly lightweight, easy to swing and very powerful. But attaching a chainsaw where your hand used to be takes it to a level of commitment that is almost unfathomable, and can be psychologically devastating to your enemies. If your enemies are anything like us, when you step to them with a chainsaw for an arm, they're probably thinking, "Not only is he willing to attack me with a chainsaw, but he's willing to cut off a part of his own body so he can use a weapon in his other hand while attacking me with a chainsaw. Screw this, I'm going home to watch Gilmore Girls."