User blog:Livin' in a fun house/OPTICAL ILLUSION ON MAGIC CARPET RIDE

http://phineasandferb.wikia.com/wiki/File:Magic_Carpet_Ride_Image11.jpg

Look at this picture from Magic Carpet Ride and turn your head clockwise 90 degrees. Now without doing that you see Buford and Baljeet sitting upside-down on their couch. But when you do, they seem to be sitting rightside-up on a different couch. It's really cool.