You tell me

If you are the first to correctly guess what the above Mystery Thingamajig is I will send you, free of charge, autographed by me and personally inscribed to you, a first edition copy of my critically acclaimed, earth-shattering, world famous book of which I have two boxes in my garage, entitled "I'm OK---You're Not: The Message We're Sending Nonbelievers And Why We Should Stop."

Good luck!

And remember: Friends don't let friends try to brush their teeth with one of these things.

(Thanks to Greta Shepard, whose blog is here, for inspiring this trail-blazing contest.)

Guess here.