Hardware's Sense of Humor

I just had to throw out a cheap USB keyboard because several keys on the bottom row had stopped working, including the "b" and "n" key.

Of course, I didn't find this out the easy way. After repeated failure to log in, I had pretty much decided that my system had been compromised and was ready to wake up our system administrator, and make him start digging through firewall logs looking for evidence of a network security breach...