Here's mine from "The Adventure of the House of Darkness" inThe New Adventures of Ellery Queen by Ellery Queen (a book of short stories, so this is only the first line of the story I'm reading at the moment):
"And this," proclaimed Monsieur Dieudone Duval with a deprecatory twirl of his mustache, "is of an ingenuity incomparable, my friend. It is not that I should say so, perhaps. But examine it. Is it not the--how do you say--the pip?"