It’s all retro at SWEENEY TODD’S BARBER SHOP, down to the chairs and cranberry gloss floors that date to 1947. (The three barbers in crisp white smocks SWEENEY TODD’S could have stepped out of a Bugs Bunny cartoon.) If it’s a meta meditation on barbershop culture, owner Todd “Sween” Lahman isn’t copping to it. He’s straight-faced with the straight edge and acts as though he’s never heard of Twitter (talk on your phone and you’ll be asked politely to scram). Every day is Throwback Thursday here, three-towel hot shave and all.