Every action has an equal and opposite reaction.
She whacked him on the back with the board she toted. She didn't mean to, she just wasn't paying attention. When would she ever learn? She was so careless, such a klutz. Even her mother said so. What would her mother say if she saw her today? Nothing good, no doubt.
"Ouch," he said.
- Every action has a reaction.
- Pay attention to what you're doing.