The Art of Sucking
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For all the credit I give Mick Napier and his excellent book Improvise, learning the rules of improv as taught by Del Close in Truth In Comedy is a necessity. Mick teaches a far more organic form of Improv that, while being a great addition to Del’s teachings pushing forward an improviser stuck in a rut, it’s major failing is if you aren’t following the ground rules in improv chances are your scenes will suffer.