In the process of trying to comment on a friend's Flickr photo I had to sign in to the terrible Yahoo product family. Their login system seems even more broken than Google's, and after a bunch of attempts at reusing credentials, wrong saved passwords, and mis-typed CAPTCHAs, I ended up resetting my password.

Out of curiosity, I typed a password (pictured here) which actually appears verbatim on an internal Google security presentation slide entitled "Weakest and easiest to guess passwords".

Yahoo refers to this password as "strong".