This is the funniest small-group sketch show I've seen all year. Jet Eveleth and Holly Laurent, improv instructors and members of long-running I.O. house team the Reckoning, have taken their first crack at writing in a show loosely representing episodes from a fictional 80s sitcom, "I Live Next Door to Horses." Playing everyone from kids to geriatrics, British socialites to American soldiers, the two adopt distinct voices, mannerisms, and attitudes to create characters, at once esoteric and identifiable, that appear to spring from deeply personal takes on humanity. One sketch, about a woman who writes letters to TV personalities, is so deliciously incomprehensible it belongs in any discussion of the most courageous bits in I.O.'s storied history. Director Pat O'Brien provides clever finishing touches, including a fantastic sound track of eclectic pop. a Through 12/29: Fri 10:30 PM, I.O., 3541 N. Clark, 773-880-0199, $14.