A John By Any Other Name

“My dear boy; Jonathan, is it? Might I perchance trouble you with a common request.
You see, I am in dire need of a moments privy in the House of Office, so to speak. A little direction, if you would be so kind.”
“What?”
“Is there any possibility that I may venture by way of the vin. Or perhaps, given the appearance of your colourful clientele, asking the location of the Khazi would be a more colloquially accurate question.”
“What?”
“Any Johns or Jacks, here or thereabouts?”
“Who?”
“Where’s the crapper?”