iRobot‘s soft, shape-shifting robot blob can roll around and change shape. This is by far one of the coolest and weirdest robot prototypes. It rolls around and changes shape, and it will be able to squeeze through tiny cracks in a wall when the project is finished.
The just-about-to-hatch pods from Alien, or perhaps something from Doom 3 come to mind. The polymer used for the bot’s stretchy skin is off-the-shelf silicone two-part rubber. By controlling the parts of the blob that “inflate,” the researchers can make it roll. The newer stuff can do much more, like having several of these things glob together into one unit.