Pimping. Fun.

The audience knows the improviser is being forced into a situation where s/he has to contribute. The power of the expectation - what is s/he supposed to deliver, what is s/he supposed to be knowledgeable of - and the power of the moment -confidently accepting the challenge/endowment - lends the best pimping moments a "it doesn't matter what s/he does/says because his/her doing anything satisfies the tension of the expectation" postive reaction. 

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Remember forever, though, setting expectations for your fellow improvisers goes against our grain. Pimping should be considered an advanced maneuver suitable ONLY when the expectation is ONLY that they say/do ANYTHING instead of SOMETHING SPECIFIC.