it would have to come out of the launcher with a speed of 130 m/s (290 mph) in order to get the kind of recoil shown in the video. What's even worse is that the guy that was hit would have an acceleration of at least 14.6 g's. So, if this is indeed a prank it's one th...
A few years ago a tractor trailer spilled a load of chemical bags. The cops cleared the entire area, assuming the worst. They did let the news cameras in close enough for me to read the labels — ferric oxide — which is basically iron rust. It took nearly an hour for a hazmat team...