Sheldon's mother talks to her son while he visits her in Houston.
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While in Houston, Howard and Sheldon hang out together.
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Howard helps Sheldon accept the new reality at his home.
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Sheldon visits his mother while he's in Houston. He's forced to accept new circumstances.
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Raj hands Howard something during the game night with Sheldon and Leonard.
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Howard smiles during a visit to see Sheldon at his University office.
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Sheldon's listens to Howard while at work behind his computer.
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Penny surprises both Leonard and Sheldon with her comment.
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TBBT Quotes

Mrs. Cooper: Shelly! I'm so glad you're here!
Sheldon: I saw you having naked sex.

Penny: I give up, he's impossible
Sheldon: I can't be impossible, I exist. I believe what you meant to say is, "I give up, he's improbable."