Sacred Haven of Debauchery

That's actually a great story. At first, I was only allowed to play for an hour and a half at home, after which I was kicked off the computer. But then I figured out the password and started playing secretly when no one was home.

I was allowed to play for an hour, and only on weekends, and only if I didn't have bad grades. If I got a "C" in a subject, I was banned from playing until the next grading period, where I had a chance to redeem myself.

It was impossible to just peek at the password, but at one point I came up with a clever scheme: I collected tiny grains of dirt from a flower and spread them on all the keys, so they were only on the black part of the letters in the most inconspicuous places. After the next time I was allowed to use the computer and the password was entered into the BIOS, I realized which keys were used, and it turned out to be easy to match them to form the password.