Read about this a while back. Pretty neat accident, but I think there’s a market for security robots in the home. In Israel, a couple came home to find that their Roomba had killed a venomous snake that snuck into their house.

…one of the autonomous vacuum cleaners took down a certain Vipera palaestinae (a venomous snake found in the Middle East). Considered a leading cause of snakebites within its geographic range, the snake was found mangled ’round one of the robot’s rotating brushes when Eli and Efi Frida returned to their home in Galilee, which they share with their two children, aged four and seven (as well as several cats and dogs).