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Create a constant keystroke-dynamics monitor with Perl and xev
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When I was in high school, a fellow geek (loyal friend and #1 competitor) read about this in a magazine. The idea intrigued him, so he put it to the test. He wrote a program in BASIC, on a TRS-80, that took ten samples of a person typing his/her own name, monitoring the keystroke patterns carefully.
Once he got the fudge-factor properly adjusted, it worked very well. I tried to type his name, as similarly to his typing as I could, but the program always rejected my typing as being from an impostor. Likewise with him, trying to type my name. Our programming instructor was very impressed.