The exercise: Write something to do with: hide and seek. Fair warning: you might want to be prepared to continue your tale tomorrow. And maybe the day after that.
The exercise: Write about: hide and seek. Family trip to the beach this morning. Visit with friends this afternoon. BBQ salmon and potatoes for dinner. Good day off. Mine: "All right buddy, I've got a few minutes before work. What do you want to do?" "Hide and seek!" "Sure, we can play a quick game of hide and seek. I'll count and you hide, okay?" "No." "No? You want to count and I'll hide?" "No." "... then how are we going to play?" "We're already playing, Dada." "We are?" "Uh huh. I already hid your car keys - now you have to seek them!"