Who/What would it be?
I would have lunch with either an Enderman (As long as I don't make eye contact, it should go fine) or Slinky from Toy Stroy.
Edit: I have no idea why this posted twice.
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Doctor Lightman from Lie to Me. Lots of discussion on FACS and Lying :D I know he is based on a real person, but I'd prefer to meet someone I can't meet through other circumstances.