If you’ve been following Outkast’s advice for developing your instant photos, the folks at Polaroid say you may be damaging them. My recommendation: shake it like a 1980’s-vintage Late Night “Viewer Mail” letter instead.*
Also worthwhile: the Peanuts “Hey Ya” video. No, seriously.
As you know, if it weren’t an actual letter he wouldn’t be able to do this (imagine David Letterman waving a blue index card in the air vigorously).