The cling wrap that Danny waves around and throws around the car in the number is a symbol for the prophylactics that men in the 1950s used to use: they would wrap themselves in saran wrap or cellophane before sex, thinking this was an effective prophylactic (it wasn't). John Travolta was told not to do anything sexual with the cellophane in the number by Director Randal Kleiser and the producers; they wanted the symbolism to be subtle to avoid an "R" rating. But Travolta disobeyed this and rubbed his crotch with the cling wrap in the number anyway, and this made it into the final cut of the movie.

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