a quadcopter with gecko feet

http://www.nytimes.com/2015/05/16/science/robot-part-drone-part-gecko.html?smid=tw-nytimesscience&_r=0

"Working with researchers at the University of Pennsylvania, they have figured out how to enable a quadcopter drone to stick a landing — at any angle — much like a flying gecko or a bat. Without any kind of suction or sticky, the flying robot can now perch on a slippery surface."

Now THAT is cool. You can land on just about any surface, at any angle.