Typical Workplace Conversation

No, I will not be taking your ranky stinky money!

"Hello, can I buy an Oyster card please?"
"Sure, that'll be £3 deposit for the card, plus the amount you want to add on."
"Can I put a tenner on?"
"Yep, that'll be £13 then please."
The customer takes a step back, lifts up his right leg, takes off his shoe, stretches his sock to one side and pulls out a £20 note. He slides it into the cash tray.
"Are you serious? I'm not taking that mate."
"What?"
"That money's just come out of your sock, I'm not accepting it."
"Why? It's still money."
"Yeah, but, it's come out of your ranky stinky sock, it's un-hygenic. I'm not taking it. You need to pay with an alternative method."
"It's legal tender, you have to accept it!"
"I'll accept it on one condition."
"What?"
"I'll put your legal tender change into my pants and you come and collect it in 2 hours."
The bloke mutters something to himself, then borrows £20 from his girlfriend and pays.
"You're not allowed to refuse money, I'm going to report you."
"I've got a customer service card in my sock if you want it."
Again, he mutters something to himself, then walks away.