Write about a good deed that brought trouble.
I can't think of an instance where this happened to me but if I do I promise to write about it.
Many, many, many years ago a lady's car broke down near my home. My brother and another gentleman went to her assistance. They reminded her not to start the car until they told her to. Somehow she got the idea that she was supposed to start the car and the good Samaritan's hand was badly injured.