Only the smartest guys from google can come up with such a brilliantly stupid bug. The android phone treats any text typed on the keyboard as a command. What makes the matter worse is that then it runs the command in the super user mode. So typing reboot on the keyboard reboots the mobile. And guess what….typing rm rf will actually delete all files. If this is stupid then the world is full of intelligent people. Read this article from zdnet for more details.