Raj has every reason to be smiling in bed as he lays next to a woman he took to bed with him. Go Raj!
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A picture of Leonard and Penny kissing in costume after Penny's ex-boyfriend is a jerk to Leonard at her Halloween Party.
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After Leonard leaves the party embarrassed by what her jerk of an ex said, Penny comes over to comfort Leonard. She's dresses as a kitten.
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Sheldon and Leonard open the door at Penny's Halloween Party dressed like quite the nerds as Penny's large friend enters the apartment.
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Wolowitz dresses up as Robin Hood for Penny's Halloween Party and here's a pic of him talking to the guys.
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Leonard, Sheldon and Raj sit on the couch at Penny's Halloween Party all dresses in costume.
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The Big Bang Theory Season 1 Episode 6 Quotes

Leonard: I understand your impulse to try to physically intimidate me. I mean, you can't compete with me on an intellectual level and so you're driven to animalistic puppery.
Kurt: Call me a "puppy animal?"

Check out the sexy nurse. I believe it's time for me to turn my head and cough

Wolowitz