1. Public, co-ed hand washing station outside toilets.
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    "Oh, hey there. You just peed too? Cool! Enjoy your meal."
  2. Pork in dishes that don't usually contain pork.
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    Bacon popcorn! Guanciale-studded risotto! Pork belly creme brûlée!
  3. Brussels sprouts.
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    Usually fried, probably containing bacon.
  4. Tiny mason jars as water glasses.
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  5. "Spirit-forward" cocktails usually containing bourbon.
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    Also served in mason jars.
  6. Servers' aprons that look like they would be equally appropriate for iron welders.
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  7. Pickles.
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  8. Bulb signs and white subway tile
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    Suggested by @sloan
  9. Quirky font usage
    Suggested by @jakebrandman
  10. Edison lightbulbs
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    Suggested by @eatthelove
  11. Juniper and Venison. Extra points if they're in the same dish.
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    Suggested by @dball
  12. Infant in ironic rock inspired tshirt
    Suggested by @gilbaron
  13. Chalkboard specials in writing cleaner than helvetica
    Suggested by @gilbaron
  14. More attention to the ingredients in a dish than service
    Suggested by @gilbaron
  15. my least favorite ... No reservations!
    Suggested by @gilbaron
  16. Oatmeal is "Steel Cut"
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    Suggested by @Nicholas
  17. A "+" or "&" in the name
    Suggested by @jeanette
  18. Community Table
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    Suggested by @dena