[JimDabell]

One amusing one springs to mind: an image thumbnailer on a website for a very popular all-girl band. It was "smart" and cropped images to the right aspect ratio based on entropy in the image. In practice, this manifested itself as a foot fetish – if a photo included feet, it would centre the thumbnail on the feet almost every time. The gallery index pages looked quite odd.

[cphoover]

I built a similar tool early in my career, only it used facial detection with haar cascade classifiers. It was kinda poorly written in PHP but it worked!