07-29-2014, 07:45 AM
What about when Sheldon was talking to Penny about Schrödinger's cat in The Tangerine Factor (1x17)? Sheldon was being his quirky self and Penny carries on the conversation with him without batting an eye to him floating around the room looking for a spot. She trusts him and his opinion enough to ask for advice, even if it was about dating Leonard.