al jaffee - master of the fold-in

you've read mad magazine, i know you have. and as you read it while standing at the magazine rack in that crappy little store, you glanced at the back, saw the illustration, so wonderfully hand-drawn, took a quick look around the store and then folded the pages over to see what the hidden image was. then you had a chuckle and put the magazine back on the rack, careful to hide the folded up back page.

well, al jaffee was the guy who drew that image (and every hidden image mad magazine has every printed, since 1964) and the new york times did an article on him.