Despite Nimh's protesting, I find this challenge to be extremely fun and interesting. What you do is also simple, in my humble mind.
Part One - Write about someone's hands. Describe them. How they look, how they feel, what they're being used for in that scene.
Part Two - Write about someone asking about Character A's hands. Maybe they ask what they're doing? Maybe they ask why the look the way they do?
Part Three - Compare both characters hands. Finish your story with this comparison.