(Those of you who remember the movie 'The Fifth Element' will recognize the post title.)
Students of military history will be familiar with the old-fashioned spigot mortar, used in such classic weapons as the Hedgehog anti-submarine projector of World War II. Interestingly, that design lends itself to rough-and-ready home-brewed artillery such as that constructed in many amateur workshops around the world during irregular conflicts. It can be built to much less precise standards than conventional mortars or artillery, yet still be accurate and powerful enough to deliver a devastating punch. (There have also been interesting variations on the theme; see, for example, the Davidka or 'Little David' produced in Israel's War of Independence, a hybrid conventional/spigot mortar design. It was spectacularly inaccurate but ear-shatteringly loud, and had a definite psychological impact on those within range.)
Syrian resistance fighters deploy a home-made spigot mortar in the video clip below, complete with home-brewed propellant - white powder in plastic bags!. They use it to take out a Syrian government missile emplacement on the roof of a building. It's rather impressive. I recommend watching it in full-screen mode.
I'm not sure I'd want to stand too close to that spigot mortar when they fire it . . . but I know I don't want to be in the blast radius of its projectile when it lands!