Many UAVs Vulnerable To Directed-Energy Weapons
mask.of.sanity writes "A New Zealand researcher has detailed ways that UAVs can be crashed using cheap tools like Herf guns and GPS jammers, and could even be downed by flying drones with more powerful radio. The attacks (podcast) interfere with the navigation systems used by flying drones and are possible because security was not designed into the architecture of some machines."
You were the kind of kid who, upon reading about dinosaurs for the first time, said "yeah, well I already knew that there was such a thing as animals", right?
No kidding!!! What do you say at this point?
You could probably take a low-flying one down with a trebuchet.
systemd is Roko's Basilisk.