That is scary stuff for sure. When we note that it's a matter of time before something like this happens, some folks will come in and say oh you're fear mongering and doing your chicken little routine, but the fact is they are just doing the head in the sand thing. It's great that it hasn't happened, and nobody wants it to, but with the proliferation of the multirotors, and some folks not using their head, it's more than probable that we'll have an issue. And yes, this can mean in a park or public area just as well as in the air.