As the title suggests, we want your opinion on which is the coolest gun ever created, be it real or fictional.
I'll start; The Shokk Attack Gun from Warhammer 40,000
What does it do? It's a gun that fires a tiny goblin straight into a portal that leads to Hell, then causes it reappear inside its target, having been driven psychotically insane by its journey. At which point, said insane goblin tears you apart from the inside out.