An old school prank. Tell someone that there is a really cool new website for online games, or somewhere they can get free mp3's. The website to tell them is Pen Island.com. Actually it is PenisLand.com, but they won't know the difference. They click the link and it ends up to be gay porn.
Two guys chatting on MSN.
1: Here check out this awesome gaming forum it even has a CSS section for you. www.penisland.com
2: Awesome I'm gonna check that out right now. (Click) Holy Shit, WTF! You are so not my friend right now!