Once at my exgirlfriend's apartment I wanted to go online. So I turn on my laptop and start looking for a connection(just moved in and haven't set up the net). I was browsing the neighborhood and found one with an incredibly stupid SSID. I just had to mess with this guy. So I accessed his router. Created a lockout period for 8pm-10am, added google, msn, myspace, facebook, cnn, and several other main sites on it and then set a password on his router panel access.
I was amused by this, for the next two weeks I noticed the setting weren't changed at all. I saw a geeksquad bug in the parking lot one day. Assuming he had someone fix it.
lawl.