Slipping a Rolled Up Bill

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In a hotel, slide the folded up $20 or whatever along with your credit card.

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Does this work without an accompanying 1-liner? What if the dude at the front desk is confused, and assumes for some weird reason, you want to pay for $20 of the room in cash?

Also... $20?? [img]/images/graemlins/confused.gif[/img] Didn't that work in like 1970?