The popularity of improv's best-known manifestation -- television's Whose Line Is It Anyway-- is double-edged. On one hand, Whose Line provides handy reference for the entire improv-industrial complex. But at the same time, the TV show, with its same McImprov games week after week (funny as they are), sets up audience expectations for a comforting repetition of forms in a genre that is, hello, all about lack of repetition. A diet of too much McImprov may be harmful to the health of your receptiveness. At its heart, the best improv is, like politics, live and local. It's sustained by inspired exhibitionists like the Mod 27 five being excited to perform singular evenings in a small Lake Worth dance studio or in all the other back rooms where talented improv troupes meet.