They'll smash me like an empty eggshell.

Empty heads, like empty eggshells, are soon broken.

At the end of last month, researchers found three empty eggshells with characteristic splits showing where the hatchlings had exited the shells.

In the morning I was up betimes, but some toast crumbs and two empty eggshells told me that my companion was earlier still.

"When we have once beaten them, France will be ours, and England crushed like an empty eggshell."