[rory]

Is this common knowledge?

"Bunny ears" – Curled index and middle fingers, palm away from the signer, usually used singularly. When used jocularly behind someone's head in a picture, they can be straight as well as curled. In Italy, Spain and Portugal, raising the two fingers behind someone's head can sign "donkey ears" (a metaphor for stupidity) or the very offensive corna (the horns of a cuckold), suggesting the victim's partner has been unfaithful.