(Ambrose has lost his hat in a crowded cinema foyer. The commissionaire hands it back to him.)
"Here you are, sir," he said. "Hereís your rat. A little the worse for wear, this sat is, Iím afraid, sir. A gentleman happened to step on it. You canít step on a nat," he said sententiously, "not without hurting it. That tat is not the yat it was."
from P.G.Wodehouse, "The Passing of Ambrose" in Mr Mulliner Speaking (1929).