Last three digits on the back of your credit card.

[Drewster]

My card hasn't got a back. It's only got a single surface.

A Mobius card?

[Doggy Styles]

A Mobius card?

Yeah, and you should see the bloody ATMs.

[threaded]

Yeah, and you should see the bloody ATMs.

Oh that's just given me an idea for a new product.

I owe you a pint.

[Sysman]

A Mobius card?

or even a Möbius strip?

[Drewster]

or even a Möbius strip?

Really!! A Mobius Strip eh?? I never knew that!

[Doggy Styles]

Really!! A Mobius Strip eh?? I never knew that!

Now now.

Anyway, threaded is about to invent an ATM that can read a Mobius card. Or something.