An Economist's Speech

The following is supposedly a true story;
An economist was about to give a presentation in Washington, DC on the problems with Black-Scholes model of option pricing and was expecting no more than a dozen of government officials attending. To his amazement, when he arrived, the room was packed with edgy, tough-looking guys in shades. Still, after five or so minutes into the presentation all of them stood up and left without a word. The economist found out only later that his secretary ran the presentation through a spell-checker and what was "The Problem with Black-Scholes" became "The Problem with Black Schools".

Yo Mama - Soy Sauce

Yo mama so black, it looks like she's been swimming in soy sauce!

Yo Mama - Cave

Yo mama is so black, that when she was sitting on my couch, I thought a cave had suddenly formed on it.