Princess and the peas.
Once upon a time, there was a prince who wanted to marry a real princess. But he could not find a real princess. One stormy night, a knock was heard at the castle gate.
Please, let me in. I'm a princess and I need a place to sleep.
The prince saw her and fell in love. He asked the queen if he can marry her. But the queen didn't believe that she was really a princess.
Well, I have a good idea.
She laid a small pea on the bed and piled up ten soft mattresses on top. That night, the girl slept on the bed. When morning came, the queen asked her how she had slept.
Thank you for your kindness. But I couldn't sleep at all because there was something very hard on my bed. Ouch! My back!
Oh darling, you are a real princess.
So the prince married the princess and they lived happily ever after