"Okay, that'll be 20p," said the cashier as he scanned my Freddo.
"What!?" I shouted. "But it says 10p on the wrapper?"
"Yes, I know it says that on it, but it is actually 20."
"Fine," I said, as I begrudgingly handed him the cash.
"Ummm, excuse me sir," the man slid the coin back across the counter. "You've handed me a ten pence piece."
"Yes, I know it says 10p on it but it is actually 20."