It is possible that Iceland is the tip of the iceberg, the first domino to fall, albeit a very small one.

And that is the tip of the iceberg because you know they aren't alert before they fall asleep. That is very alarming to me.

Is this the tip of the iceberg? We don't know.

This is just the tip of the iceberg.

The bestseller list is the tip of the iceberg.

The bestseller list is the tip of the iceberg.