As much as it pains me to say it - Outkast got it wrong. Polaroid reckon you shouldn't actually shake it like a Polaroid picture because rapid movement during development may damage the image.
Philippe Roucou on the other hand, is definitely getting it right. This French bag designer has recently released a limited edition series of 100% silk scarves. Each piece features an image from an anonymous Polaroid that has been found by happenstance. Although these scarves come with a hefty price tag, shaking them won't damage the image!
CAD $449; available online from Reborn.