Questions

I was preparing lunch for my granddaughter when the phone rang. ' If you can answer one questions.' a young man said. 'you'll win ten free dancing lessons.' 

Before I could tell him I was not interested, he continued, 'You'll be a lucky winner if you can tell me what Alexander Graham Bell invented.'

'I don't know,' I replied dryly, trying to discourage him.

'What are you holding in your hand right now?' he asked excitedly.

'A sandwich' 

'Congratulations!' he shrieked.

'And for having such a good sense of humour ...'