Once upon a time, a man saw a doorbell hanging from someone's door and wanted to steal it.
But he knew that if he were to steal the bell, it would start ringing the moment his hand touched it. If he were discovered, not only he couldn't get the bell, but he himself might also be caught.
He thought this over and said to himself:
"Why will there be trouble when a bell rings? This is because our ears can hear it. If I cover my ears, I won't be able to hear it. This way I won't be caught."
Later, he eventually got an idea. He first covered his own ears, then went on to steal the bell. However, in the end he was still discovered and caught red-handed.