Before Diddy was a spokesperson for Pro-Activ, there was this promotional tape about the prescription anti-acne cream Retin-A: the Retin-A rap:
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I like how the first half of the video (and the rap) are about how great Retin-A was, and the second half is about how you shouldn't give up even when the side effects are terrible. "Itchy-scratchin ITCHY ITCHY means it's doin' it's job!" (Via Video Home System.)
