I have fried a PS/2 port before by doing that. Once, in the 1990s, at work. That doesn't tell you how often it happens though because I haven't hot plugged in a

I have fried a PS/2 port before by doing that. Once, in the 1990s, at work. That doesn't tell you how often it happens though because I haven't hot plugged in a PS/2 device since then (and now I don't use them much anymore).