I thought it'd be about skipping stones at first, but rock smashing works too. I had a few goes at that as a kid as well. I wore safety goggles though because you don't want that shit hurtling at your eyeballs at opened-the-door-in-Skyrim-at-above-60-fps speeds.
If you don't get that reference, doing so will send nearby objects flying around rooms fast enough to kill your character on impact. Way more badass than throwing stuff with telekinesis, that spell's weaksauce.