Take for exapmle, i was just reminded on my MSi K8n Neo 2 Platnum that the Nforce2 Network controller dosent work, So, i disabled it... as soon as i clicked "disable" the computer rebooted.
hahaha, Or how about this one, an old Netgear router 4port switch+ 802.11B.. when a wireless client would connect, it would disconnect the modem and all clients could access the router but not the internet...
Even beter, i have an old Asus p2b with an old Cel in it, This was the BEST Server EVER.. no matter what happened or what you did to the computer, if you plugged it in.. it was on.. simple as that..
if you pressed the power button, it would shutdown windows and reboot. If you held the power button it would shut off Untill you let go of the botton. Perfect for a 24/7 folding/server box

So cmon, Gimmie some Odd things that your hardware has done.