The Clever Mustache

I've been watching the sly little mustache sweep through the indie design world for at least a year now which leads me to wondering how this whole 'disguise' trend got started as a design motif in the first place? Anyone know?

Shown above: cards from elephantine and owl print from hoorah.

I've seen it used on pocket mirrors and buttons, wallets and art. Also necklaces, sticker packs and even on posters, throw pillows, rubber stamps and silver stud earrings. This crafty man knitted and framed his own and Mr. Octopus seems to be enjoying his immensely.

Marcel Duchamp drew one on a copy of the Mona Lisa once so is this some kind of modern day take on that? Hmmm. Anyone know?

(images from elephantine and horrah)