Reminds me of the time in college I realized that the university network's dynamic DNS configuration was wrong and that if I named my Linux laptop with the same hostname of the mail server, I became the mail server when I connected to the network. (I used an ethernet jack in the cafeteria and a random PCMCIA network card I found in the help desk stash so they wouldn't trace the problem back to my school laptop. The IT department already hated me for unrelated reasons.)