Not for the faint of heart, Aunt Dan and Lemon ruthlessly examines the worst of human nature and comes to the conclusion that our compassion is mostly conterfeit. But if you can get past the virulent amorality of the play — it's bookended with a monologue that's in part an argument for why we should thank mass murderers — there's a treasure trove of dark comedy, as well as a beautifully clinical study of the 1970s (including an amazing rant about the political and sexual prowess of Henry Kissinger). Backstage's production is smart, placing the audience in couches and chairs that are part of our narrator's living room — the story is all flashback — as she tangles us up in her Machiavellian doctrine.