This is an activity I hope you will enjoy.
The idea is to draw a single panel from an imaginary comic, without context. The panel should seem like it is taken from an existing story, but that existing story doesn't exist, so the panel by itself should suggest that there is a wider story.
You can use this as an exercise to practice comic compositions (including possibly new and interesting panel shapes), to practice your ability to do storytelling through a single image, or just to have fun with the concept and suggest an entertaining wider story. Anything you want, really. It should be fun.
In summation:
Activity:
To create a single comic panel, without context, that seems to be taken from an existing (though in reality, imaginary) story.
Here's my example: