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"I'm very sorry Sir", says the young assistant. "If you'd care to step into the booth again, I can play you have another track."
The world expert on European wasps and the sounds that they make steps back into the booth and replaces the headphones.
Three minutes later, he comes out of the booth shaking his head. "I don't understand it", he says, "I am the world expert on European wasps and the sounds that they make, and yet I still can't recognise any of those!"
"I'm terribly sorry, Sir" says the young man, "perhaps if you'd like to step into the booth again, you could hear another track."