American Express Diamond Card
From Tardis Wiki, the free Doctor Who reference
The American Express Diamond Card was a credit card given only to billionaires. It had unlimited credit.
The Seventh Doctor had one with the name Dr John Smith. He used it to buy Snackee Cakes at a Nev-R-Close. (PROSE: Clean-up on Aisle Two [+]Loading...["Clean-up on Aisle Two (short story)"])
