A despairing realtor falls apart at a suburban open house in Steve Spencer’s hilarious dark comedy. After his wife leaves him, Jack’s a mess. He passionately embraces another man’s wife, prods a couple into physically assaulting him, and downs tequila with a prospective buyer. But only a happy liberal couple, at whom Jack spews a dark tirade of distrust, contributes–unwillingly–to his rapid downfall. Jack’s not alone in his angry unhappiness, which makes it easier for audiences to laugh at Spencer’s acerbic commentary on globalism, commercialism, and sweet hopes for the American Dream. Even small gestures speak volumes in Vance Smith’s attentive staging for Black Sheep Productions and Reverie Theatre; the fine cast is led by Kevin Stark as caustic Jack. –Jenn Goddu a Through 4/15: Fri 8 PM, Sat 5 and 8 PM, Sun 3 PM, Royal George Theatre Center, 1641 N. Halsted, 312-988-9000, $15-$20.