The Swiss cousin of UPenn's quadrotor assassin, this flying juggler blows off steam at Zurich's Institute for Dynamic Systems and Control. Specifically, in something called the Flying Machine Arena, which I imagine to be something like a quardotor Thunderdome. It's here that the bots practice things like "Adaptive High-Performance Manoeuvres" and "Flying Inverted Pendulum", and all sorts of other weaponized-sounding moves.
All of which is to say: we're onto you, quadrotor. You can mesmerise us all you want with your ball-bouncing antics. But I'm well aware that one day that ball's going to be a grenade, and it'll be aimed right at my window. [IDSC via BotJunkie]