Advertisements in the form of trading cards that you receive in Vegas while walking down the strip.
flick, flick, flick, flick ... flick, flick, flick, flick.
Tourist: "What's that sound?"
Mexican: "Ladies, smoke, week, blow, strip club?"
Tourist: "How about a pile of those hooker cards?"
Mexican: flick, flick, flick, flick ... flick, flick, flick, flick.
Tourist 2: "What's that sound?"