On a related note, there is the infamous (in narrow circles) issue of the serial consoles on old Unix systems. Many had an option to "press any key for boot menu" on the serial console. The problem was that the serial consoles would get enough static interference to occasionally detect a character while this option was available, and it would halt the boot process. On a datacenter reboot (usually due to power loss), a handful of servers would never come up because of this. It was far more reliable to require a particular character to be received to break the boot sequence, although there is a risk that even that could be triggered, but FAR less often.