Two PostScript files which seem totally different (you can read them with a graphic program like PaintShopPro, or RoPS, or Ghostscript), yet with the same MD5 hash...
Binary compare them to start imaging the trick...
http://www.cits.rub.de/MD5Collisions/

Regards, bilbo

P.S. I saw the link on another forum, provided by Cthulu

It's Cthulhu :-)
My best regards friend!

Hi, Cthulhu,
it sounds like "The Great Old Ones" are not dead!
Regards, bilbo