The robotics lab at Ben Gurion University in Israel has created a robot that walks on the ceiling. SpiderBot has suction cups tethered to the ends of its four legs. It aims a leg at a spot on the ceiling, then shoots the cup at it. Then it reels itself toward the spot, releases a rear leg's suction cup, and slowly repeats the process. Video at the link.
Link via DVICE
Now the Palestinians won't be able to dance on the ceiling without these things after them.
Lionel Ritchie will be heartbroken.