Prehistoricle people spent all day banging rocks together so they could find food.

They turned to see Chekov, surrounded by an audience of assorted Sivaoans, banging rocks together.

Others banged rocks against metal fence stakes.

The dolphins are driven onto the beach by men who surround the pod in dugout canoes and interfere with the dolphins ability to navigate by banging specially shaped rocks together under the water.

Germany, I'm not entirely sure about, and last time I looked, the French were still banging rocks together as far as mobile broadband is concerned.

With this we went from banging rocks together to using a blowtorch.

"The cavemen, banging rocks together," Patrick said dryly.

'And you when you were banging rocks,' said Magrat.

The little boys were banging rocks together to see if they could make sparks.

"We're not banging rocks together, here..."