It would probably take a bolter shell to crack that thick skull of his.
— Commissar Ciaphas Cain, on Jurgen
"Um. Hard. Head. It's not just a name, you know."
— Hardhead, IDW Transformers comic series
My name is Bond, something Bond. I think. You'll have to forgive me. I've been rendered unconscious so many times that I suffer from long-term memory loss. [...] Sorry, honey, I meant to clean that vomit off my shoes.
— Wanjek, Bad Medicine