His political ideas are from 'the Stone Age'. [=are from the distant past; are very out of date]
Their lawyer said that he would 'leave no stone unturned' in trying to find more evidence.
The researchers 'left no stone unturned' in their search for the original documents.
(..) is a prisoner. A prisoner of the Pink Panther. Why is it called the Pink Panther? The stone is flawed. If it is held up to the light in a certain way, the figure of a springing panther can be seen clearly. Good morning, sir. (..)1975 The Return of the Pink Panther