"He's just a guy who makes YouTube videos" is probably about as dubious as it gets when it comes to a description of someone, but I assure you that at least a couple of Dave Hax's vids are worth watching. He's a DIYer in the loose sense of the word—meaning that he just as often takes the acronym to mean Destroy-It-Yourself. He recently posted a short tutorial on how to make a miniature bow-and-arrow, with flaming ammo to boot. I have yet to try it myself, but it looks pretty neat:
One could say that he hasn't lost his childlike sense of wonder about the world... specifically, what it looks like getting destroyed in slow motion or getting set ablaze. Here's a short how-to on a flaming Jack-o-Lantern that shoots flames from the top of its head (originally posted for Halloween last year):
As the saying goes, it's not rocket science.