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 [=are from the distant past; are very out of date]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.
(..) You know what l mean? Is that it? ls that crazy enough tor you? Want me to take a shit on the tloor? Christ! Have you ever heard the old saying. ''A rolling stone gathers no moss''? Yeah. Does that mean something to you? lt's the same as ''Don't wash your dirty underwear in public.'' (..)1975 One Flew Over the Cuckoo's Nest