I went to the park today and passed a skating rink. There was a sign on the front that read "Restrooms are for rink customers only."
And I thought, "I dont really need to go to the bathroom, but now that you mention it it couldn't hurt.
I blazed past five more signs inside the rink on the way to the bathroom, peed, and turned on my heels to walk back out. I ran right into a rink official.
"Bathrooms are for customers only," he said to me. "Are you a customer?"Dick.
"Oh. ok," I said, "I'm a customer."
"That's impossible," he said, "we don't have any customers today, we're closed."