"I'm sure they have a magical equivalent for glass dildo cleaners. Or they don't and STDs are the new plague." He shrugs, completely nonchalant with no hope of a sale.

..And then the guy comes around, and Dave doesn't mean to look completely surprised. But he kind of is.

"Really?" Wait.. "Uh.. I think you need to pay money for it. Do you like.. have money?" He knows this guy is from a different time and place because he knows what windex is.