This site appeals to me on so many levels, I just don't know where to begin.
The geekery (high-tech image recognition algorithms.)
The clever, and bad, pun in the project's name.
Ladies and gentlemen, with no further ado, I give you...
Which seeks to answer the question, "How do we keep our indoor/outdoor cat from bringing live prey into the house through the cat door?"
(From a thread on Ask Metafilter.)