Fight Sp@m

Are you getting annoyed too with all those advertising sp@m mails and pôp-ups you have to deal with every day? Ever wanted to get revenge, to get even? Well, now you can, well at least a little bit. [edit:sorry, dead link] specializes in using up sp@m sites' bandwidth. Just open the page and let it run as long as you like, every second you leave the window open, bandwidth is used from the sp@msites, shutting them down eventually when they exceed there monthly bandwidth allowance :)
This will make them lose revenue and abandon the site. Probably to start a new one, which will be attacked too :)

EDIT: Sorry, the link died :(