Comment: What is the difference between

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What is the difference between

a light bulb and a prostitute?

Edit: I didn't get that exactly verbatim, but here is the jest of it:
http://youtu.be/fMknMZP_zX4 (Steve Martin in My Blue Heaven)only 35 sec. long - If Rand could have listened to the wisdom of Steve Martin instead of Benton & Olson.