batsinthebelfry Sign of insanity? Problem upstairs? Nutty tenants Mental eccentricity ... as suggested visually by some of this grid's black squares Loose screw Halloween craziness? Crazy, proverbially (with "has") Crazy people have these Crazy condition Animal kingdom eccentricity What crazy people have Craziness Disordered senses What kooks have What those who go bonkers have Where in church is Masterson? Intruders Crazy animals going like the clappers? A screw loose Signs of insanity?