You've problably seen the following picture before on the internet of a guy on top of the WTC right before the attacks:
But, in the tradition of the whole "all your base" phenomenon, the picture has been spread and modified with hilarious results. Here are some of my favourites:
For more, go to TouristOfDeath.com. There's also a fun article about it at Wired, which talks about a guy who claims to be the dude in the picture.