Not really a reusable one, but a funny anecdote
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Scenario: Two friends walk into a music store and speak with a clerk about purchasing some software.
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FRIEND 1 (manner of fact): "Can I get the Reaktor 4 retail box upgrade?" ($150)
CLERK (un-ironically): "Are you a Reaktor user?"
FRIEND 1 (sarcastic): "Nah, I just planned on using it as a coaster."
CLERK (defensive): "Hhh! You know MAX/MSP or Pure Data are a way better investment. They're way more low level and can do all sorts of things Reaktor can't."
FRIEND 2 (unimpressed): "That so?"
CLERK (smart-ass hotshot): "Pure Data is the best, since it's free and totally open source. It's super complicated and can let you do any kind of low level programming you want. It's better than any commercial tool and you can customize it to do anything."
FRIEND 2 (unimpressed): "You use it a lot?"
CLERK (wavering): "Well, it's really hard to get set up on a PC because of the way it talks between modules over internal TCP protocols, so I never got around to finishing the installation..."
FRIEND 2 (deadpan): "Well, you know, I teach a free class on both MAX/MSP and Pure Data at ******* on Tuesdays twice a month. You should come by and maybe we can help you get the program installed."
CLERK (BURNED): ".... Uh... Yeah..."
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*FRIEND 1 and 2 leave after transaction.
FRIEND 1: "HAHAHAHAHAHAHAHAhAHAH" *pisses himself laughing*