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 [=are from the distant past; are very out of date]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.
(..) I'm personally insulted. Snakes don't talk like that. It is a stereotype and it's offensive. Bad enough some of our relatives are hanging out with Medusa... turning people to stone. All right. I love your hair. I wish my hair would do that. Yeah, that will happen. Why don't you guys (..)2013 Percy Jackson: Sea of Monsters