As Leonard and Raj go to get Wolowitz from his house for their Halo team they overhear his mother fighting with his new girlfriend.
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Wolowitz shows up in an awfully feminine robe after sleeping with Penny's friend and forcing Penny to crash on Leonard and Sheldon's couch.
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Penny joins the boys for a game of Halo and they're a little shocked that she's not bad at the game.
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The Big Bang Theory Season 1 Episode 7 Quotes

I don't know how, but she is cheating! Nobody can be that attractive and this skilled at a videogame

Sheldon

Can we please make a decision? Not only there are children starving in India, there's an Indian starving right here!

Koothrappali [on waiting for food]