Sheldon and Penny head to the cleaners to try and get a paint stain out of his couch cushion. We highly doubt that's going to work.
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Sheldon is horrified when he finds a paint stain on his couch on next week's episode. Penny is going to get into some serious trouble for this!
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Howard Wolowitz and Leslie Winkle do the nasty on next week's episode of The Big Bang Theory, "The Cushion Saturation." Really Wolowitz, Leonard's ex? That's not cool, even for you.
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Raj takes the microphone as he, Wolowitz and Sheldon play some Red Hot Chili Peppers in the video game, Rock Band. Raj kind of sounds like a dying cat but we loved his performance.
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Sheldon and Mrs. Hofstadter (Christine Baranski) decided to perform a little duet in Rock Band to some Journey. Watching them sing and dance was priceless.
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Mrs. Hofstadter goes with her son Leonard to work and meets all the guys at lunch. She quickly analyzes each one of them.
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Mrs. Hofstadter (guest star Christine Baranski) meets Penny on the way up to Leonard's apartment and has no problem analyzing her and figuring out all her father issues.
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After some much needed tequila shots after Leonard's mother terrorized them, Penny and Leonard share a drunken kiss!
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Leonard and Penny decide to do some shots of tequila and after licking the salt off Penny's neck, Leonard has to go in for the lime.
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A picture of Sheldon and Leonard's mother (Christine Baranski) looking over some brain scans of Sheldon's. The two of them get along frighteningly well.
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Sheldon may have more neuroses than anyone on the planet, but some how this nerd has no problem doing one of the most awkward things... lending a friend money.
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Leonard uses the board to attempt to find the perfect combination of movie theater and restaurant based on start times and Sheldon's idiotic requirements.
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TBBT Quotes

Penny: What actor holds the record for being named People magazine's Sexiest Man Alive?
Sheldon: William Shatner!
Leonard: I don't think it's Shatner.
Sheldon: Then it's got to be Patrick Stewart

Penny: Hey, Sheldon, did you change your Wi-Fi password again?
Sheldon: Yes, it's "Penny, get your own Wi-Fi." No spaces.