I crumbled one.

Phew! It hurts me to see my identity crumble.

The volcano crumbled into the sea.

Where did you crumble them?

Sami's world crumbled.

The church we went past crumbled five minutes afterwards due to a huge earthquake and more than a 100 churchgoers were buried alive.

She crumbled a biscuit.

Dan crumbled the sandwich and threw it to the floor.

That's the way the cookie crumbles.

Damn!  It hurts to see my identity crumble.