Doing site-specific works can be a gimmick. But in Sandbox Theatre Project's hands, this play performed in a Lakeview bar about three twentysomethings hanging out in, yep, a bar is effervescent and true, inventive and fun. Playwrights Cliff Chamberlain, Chelsea Cutler, and Justin D.M. Palmer aim to explore, if not exactly the road not taken, then how slight variations in personality can translate into different paths: nine actors portray three versions of the three friends. The result never winds up making intellectual sense, but it doesn't have to. Under Palmer's startlingly good direction, the ensemble--which also includes two actors playing two additional characters--brings to life 11 people who give us a great night at the bar. Through 11/7: Mon 9 PM. Matilda in Lakeview, 3101 N. Sheffield, 773-456-2329. $15.