Noises Off! It's awfully frantic backstage at Philadelphia's Grand Theatre, where play-within-a-play Noises On is in its final dress rehearsal. The hours tick away before the premiere; the hapless cast can't remember lines and simple stage business; the director can't get these clowns to mesh; and shifting love affairs and alliances complicate matters needlessly. During the second act of Noises Off!, it's one month later, and we're watching the disintegration from backstage. The third act takes place another month later, giving us the audience's perspective after this sad-sack troupe's been on the road, and cast members are totally sick of one another. What a car wreck of a production it's become. Michael Frayn's brilliant farce of farces keeps Country Playhouse's intrepid cast hopping and the audience in stitches as the catastrophes intensify. One of the funniest plays ever written, it has absolutely no redeeming social value; there's no moral. The sole purpose of Noises Off! is to make us laugh, and it succeeds brilliantly by using pratfalls, split-second timing, door slams, pants around the ankles, a plate of sardines and a wayward fire ax. Director O'Dell Hutchison keeps the crazed stage traffic at near-miss speed without losing any momentum; it's frantic but not frenetic. It's a difficult balance -- too much nuttiness, and the delicate soufflé falls flat; not enough craziness, and there's no comedy. Like Baby Bear's bed, this production is just right. Caught up in the shenanigans, the ensemble cast of these lovable losers (Barbara Lasater, Larry Hermes, Kenneth Jones, Julie Thornley-Jones, Stacie Williams, John Dunn, Lesley Tesh, John Mitsakis and Carl Masterson) deftly juggles all the hilarity with a refreshing, free-spirited tone. A very funny evening in the theater. Through May 28. 12802 Queensbury, 713-467-4497.