Creative, but no, thank you

I spotted Daniel on the upper level of the play structure recently with a big bucket of rocks, while Matthew was playing on the ground. As I started to remind him of the "no rocks (or other heavy objects) on the top level of the structure" rule, he interrupted me, exasperated, saying

"but Mom! How am I supposed to play meteor shower?!"

He definitely gets points for creativity, but I'm pretty sure Matthew would prefer to stick with meteorites on the less-realistic side.