Nerf guns are obviously designed with limited kick to be safe for kids. But if you're older, and irresponsible, you crave something with a little more firepower. Which is what led Make's Dan Spangler to build this propane-powered dart cannon.
It's assembled from PVC pipe and is fuelled by a BernzOmatic propane torch, which gives it more than enough kick for the foam dart to actually put a noticeable dent a whiteboard. So there's only one way to sum up this crazy and potentially dangerous experiment: Complete success! [YouTube via Make]