Here's a how-to video you probably shouldn't follow, teaching you how to build a do-it-yourself explosion maker you probably shouldn't make, so you can make simulated action movie fireballs in your backyard. Which you probably shouldn't do.
DIY instructor extraordinaire NightHawkInLight shows us how to build a home-brew rig that belches action movie fireballs in miniature form. It's enough to get anyone's adrenaline gland throbbing with delight, but the process is definitely on the involved side. Which is good, because we cannot stress enough that you most likely should not build this device.