I am sorry if this may have been answered in some way before, but I am terribly interested in how you track previous entries to link to. Is it your tagging system? Your amazing memory about previous terrors? Some terrible rift in the blogosphere that seeps history? How? HOW?!
Pretty sure he's using his consistent system of tags for this. An overlapping between "parts" and "teeth" produces most of these previouslies. Then add some "robots"+"teeth" and you're good to go.
I think you forgot this: