“Children are meant to be seen, not heard,” grandpa barked.
Andy stopped yelling. His eyes narrowed on grandfather’s mean mug.
For the rest of the day, he played quietly.
After dinner, grandpa had coffee.
Andy grinned.
The laxative he slipped him would make grandpa’s rear-end heard by the whole household.
This is my entry to 
I hope you enjoyed my fun little revenge story. The image of this story popped into my head pretty quickly when I saw the prompt.