I'm very much anti-patent. I'm especially against software patents because they don't make sense, and in the long run they will end software development as we know it. Now, with the 2004 Ig Nobel Prize Winners announced I see I was wrong. There are areas where patents are even more wrong or stupid.
Look here at the United States Patent and Trademark Office for some fun reading.
Warning! Explicit and possibly scary images if you follow the link below. Images show criminal acts; no user holds a valid licence.
Look here for some patent infringement crimes.