If I Was A Super-Hero

"Dude, I'm sorry I broke your arm," you say.
"But, how was it possible that you broke it like that? All you did was touch it, and you didn't even apply that much force," says your friend.
"I don't know," you say.
"Here, try and crush this rock," your best friend says. You crush it to powder. "Wow, I wonder what else you can do? What do you want to try?"