Improv Asylum was founded in 1998 by Paul D'Amato, Norm
Laviolette and Chet Harding in Boston, Massachusetts as an
improvisational comedy group and theater.
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lamb rib
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Mostly The Second City improvisational comedy theater in Chicago. Also, National Lampoon: Lemmings and Monty Python.
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An ad-libber is a person who ad-libs, or who is skilled in
ad-libbing - improvising a speech or some other performance.