> At least if you tried to plug a USB cable into an ethernet jack it would be immediately obvious that it wouldn't work. Not necessarily. Ethernet jacks are of

> At least if you tried to plug a USB cable into an ethernet jack it would be immediately obvious that it wouldn't work. Not necessarily. Ethernet jacks are often wide enough that a USB-A plug can be partially inserted, and it's pretty common to stack the two types of ports. If one isn't looking directly at the connector (common when dealing with the back side of a tower or docking station), it's a surprisingly easy mistake to make.