https://www.vice.com/en_us/article/epzex7/scientists-made-a-liquid-metal-robot-that-can-escape-a-cage-like-a-t1000-terminator

Scientists have created robots that can shapeshift between solid and liquid states, enabling them to perform mind-boggling feats such as jumping, climbing, and even oozing out of a cage in a way that is eerily reminiscent of the T-1000 robots of the Terminator franchise, reports a new study. 

The shape and movements of the machines are controlled by magnetic fields, an approach that may lead to new biomedical and engineering technologies, such as targeted drug delivery, circuit assembly, or the creation of universal screws.