Then there's FireWire... Supposed to be hot pluggable, but easy for careless people to fry things. I remember countless DV camcorders with fried FireWire ports and a few that were completely dead from students and staff misaligning the 6 pin plug when connecting to the computer's powered port. The cameras all had a 4 pin unpowered connection, so it seems there was no protection there. The user would invert the plug when connecting to the computer, powering the data lines on the device. On eMacs and iBooks, it would kill the FireWire port on the computer rather than the camera, blowing a fuse that could be desoldered and replaced. The ubiquitous iMac G3 slot loaders would wreck the cameras. We tried to institute a policy of connecting the cable to the computer first to avoid the mismatch, but... I ended up having to solve the problem by hot gluing cables to computers. Sometimes behaviour has to be modified by the environment.