Hiccups

This is from a teller working somewhere in Europe, her account:

I am a teller at a bank, and I have a nasty hiccup I cannot get rid of. A customer approaches me, having questions about his savings account. He also has a 50 Euro bill in his hand. I answer his questions, while trying to suppress my hiccup. When I hand him his documents he had given me before, he takes them, turns away, then turns back to me.)
 
Customer: “Where are my €50 notes?”
Me: “You did not hand it to me.”
Customer: “I did give it to you; it was in my savings book.”
(I panic, because our branch is pretty busy, and sometimes I forget things. I look around for the €50, even underneath the service station, but nothing. We argue about the money for a bit, and then he smiles.)
Customer: “Sorry, I have the money. I just needed to scare you a bit to help you get rid of that hiccup.”
(I was staring at him while he proceeded to the cashier to put the money onto his savings account. I was shocked, but he was right: my hiccups were gone!)