Don't know this movie, but I heard a version of this funny cumulative song in England, back in '79. Supposedly, someone would trick a pretty young thing into standing up on top of a stool, and then would point to the body-part being sung about! (Don't know that it ever happened this way, but it makes a good story!)
"Touched her on the toe; that be m' share; that be m' toe-tapper, n' you can play there. Toe-tapper (fill in more of the cumulative song as you go)loves my dear; the more I loves, my dear draw near."

out-lookers, snot-box, chatterbox, chinny-chops, breast-plate, navel-stringer, funny thinger, thigh-thacker, knee-knacker, toe-tapper
(I'm probably missing some of the body-parts!)