Steven Levitt: "If drug dealers make so much money, why do they still live with their mothers?" A presentation from February 2004, slightly before Freakonomics appeared. [Attention! Inappropriate language ahead.]
We especially like the theory versus practice slides:
Theory: A compensation differential is the increment to wages that a worker requires to leave him indifferent between performing two tasks, one which is more unpleasant than the other.
Practice: Would you stand around here when all this shit is going on? No, right? So if I gonna be asked to put my life on the line, then front me the cash, man.
Theory: Every two-person game has a Nash equilibrium.
Practice: If we start shooting around there, nobody, and I mean you dig it, nobody gonna step on their turf. But we gotta be careful, cause they can shoot around here too and then we all fucked.
Theory: Cash flow constraints dictate that the local leader cannot make large losses in any month.
Practice: You got all these niggers below you who want your job, you dig? If you start taking losses, they see you weak and shit.
Get the 
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