An old bloke was going into the supermarket and as he went past the checkout chick, she says to him quietly "The Barrack door is open".

He doesn't understand what she is talking about so he just keeps going.

While he is standing in front of the shelves a little girl comes up to him and tells him his fly is open. He now realises what the checkout chick meant about the barrack door.

He gathers all his groceries and goes back to the same checkout and as she is scanning his groceries he says to her "When you saw the barrack door open was there a soldier there standing to attention."

She says to him "No all I saw was an old vetran lying on a couple of bean bags"