It’s just a silly drabble, but I know you are not averse… Pocket Billiards **** “So, why has Seamus started calling Dean ‘Jack’?” Ron asked.
“It’s short for ‘John’, isn’t it?” Harry replied.
“Ignoring the fact that it’s the same length as ‘John’…” Ron said.
“Well, that would make him ‘John Thomas’,” Harry explained.
“So… if I called you ‘Bob’, short for ‘Robert’, which isn’t your name, that’s funny?”
“No,” Harry said patiently. “‘John Thomas’ is Muggle slang for penis, and it’s Seamus’ pet name for Dean’s equipment… so that’s like you calling me ‘Dick’, short for ‘Richard’, which isn’t my name, but you lie on the pool table and I’d be your ‘Dick Potter’.”