I will only buy wireless input devices from now on. Last week I tripped on a power cord for my laptop; the power jack was bent but the laptop was fine, despite crashing to the ground. (Good thing my host had a nice thick throw rug.) Then just now, I tripped over the cord to one of the weirder input devices I've owned, the Belkin Nostromo n52. Elementary physics indicates that when a cable connecting two items of unequal mass is tugged in the middle, the item with lesser mass will move. The heavier object (the laptop) will require more force to overcome static friction, especially if it has little sticky rubber feet.