ATM design flaw

I just noticed at a local ATM that there was a sign right next to the slot for the cash reading:

Don't forget your money!

Though it never happened to me personally, I do know some friends who actually forgot either their bank card or the money in the ATM. So the warning does make sense.

However, isn't there a fundamental design flow in the user interface or process of an ATM when you have to remind the users of the very one thing they came here for in the first place ??

Quite frankly, I'm not sure how to fix this, maybe glue the card to the money?