What came first?

Came across this "man's hands" ad for Oral B the other day.

Don't know 'bout you but I find the image rather disturbing.

Which is not really the sort of feeling an ad for a kids toothbrush should leave you with.

What's more disturbing however is how closely the idea in the Oral B ad resembles the cover of Tina Fey's book Bossypants.

Coincidence?

I think not.