Are you calling my mum a liar?
The ultimate comeback to any request, insult, or question. Completely and utterably unanswerable.
Delia Smith: Now we just need to drain the parsnips, and Gordon could you spread the Italian Pesto over those pheasant breasts?

Gordon Ramsay: Are you calling my mum a liar?

Delia Smith: Am I what? No, of course not...what do you mean?

Gordon Ramsay: Well F*ck off then.