A Wolf was eating food and he got a bone stuck in his throat.
He couldn't get it out. He couldn't eat.
Then, he saw a Crane. He thought with her long neck and beack, she could save him.
So, the Wolf went near the Crane and asked her for help. He told her he will reward her.
The Crane was nervous to put her head in the wolf's mouth, but she helped him.
Once the bone was out, the Wolf started to walk away.
The Crane asked for her reward. The Wolf said, "Me not eating you is the reward."
Lesson: expect no reward from the evil.