Proving that they have nothing better to do, British scientists have developed a way to establish a secure wireless link between two cell phones by shaking them very hard. No, seriously, no more passcodes or keywords, you just shake your phones together:
Built in accelerometers are used to measure the movement of each device as it is shaken. Only if the devices are held tightly together will their accelerometer readings match perfectly, which tells the system it is safe to establish a connection.
When asked for what they plan to do next, the scientists said that they're planning on a way to synch up two laptops wirelessly by pushing them together and making kissing noises.
Synchronised shaking connects gadgets securely [New Scientist]