[arb99]

This one is interesting too... http://ssbkyh.com/works/cat_human/

" Human faces recognized as a cat face by a cat face-detection algorithm"

and

"Cat faces recognized as a human face by a human face-detection algorithm"

[bitwize]

A lot of Serious Cats got recognized as humans...

[TheOtherHobbes]

Aren't there entire websites devoted to this?