The American improv troupe is one of Amsterdam's biggest success stories. With several different shows running seven nights a week (except Sundays in winter), all in English, the group offers a mix of audience-prompted improvisation and rehearsed sketches. Recent shows have included Me, MySpace and iPod and Best of Boom: The Director's Choice. Heineken Late Nite is particularly rewarding: if the improvisers like your suggestion, you get a free beer. The bar offers cocktails and DJs, and is something of an unofficial meeting point for countless wayward Americans; a restaurant serves lunch from noon until 4pm daily. They even publish a free magazine for visitors that are new to Amsterdam. All in all, a genuine cultural movement in an unexpected form.