Hairy Leonard is very eager to see Penny upon his return from their three month expedition and is a little upset at Sheldon for crashing their good makeup time.
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Sheldon comes crawling back to his mother's home in the season three premiere of The Big Bang Theory when his arctic expedition doesn't go as planned.
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So what do you think of Sheldon with a little facial hair? You're going to get a chance to see him with a goatee in the season three premiere of The Big Bang Theory.
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Sheldon and Penny will never get together. Jim Parsons says these characters are just too good of friends.
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Sheldon is angry at Stuart for ruining the latest Hellboy comic book for him with the spoiler of "it's mind blowing." He tries to get his revenge by ruining the latest issue of The Flash.
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In erhaps the most ridiculous situation, Sheldon ends up sleeping in Penny's bed... and somehow this doesn't make the man happy! We'll trade places with you...
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When Sheldon crashes in on Stuart (Kevin Sussman) and Penny's date, he ends up arguing with Stuart on comic books until they put Penny and Stuart's chances of getting lucky to sleep.
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Leonard and Sheldon greet their new neighbor, Alicia (Valerie Azlynn) as she moves into their building right above their apartment. Sheldon drills her with his usual awkward questions like does she like area rugs?
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Penny brings in Chinese for the guys and hangs out in her sweats. Don't worry, for now Wolowitz still thinks she looks ravishing. It's only when the new neighbor shows up does Penny need to step it up.
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When Raj, Wolowitz and Leonard ignore Penny in even her hot little dress in favor of the new neighbor, Penny is stuck with hanging out with Sheldon.
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Sheldon and Penny sit down and sing a sea shanty as they make Penny Blossoms (Penny's hair berets). You have to hear / see it to belive it.
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The gang eats Chinese food and Sheldon has nowhere to sit when his cushion seat is covered in paintball goo. We feel for your pain Sheldon.
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TBBT Quotes

I just gave you my virginity, woman. Cool your jets!

Sheldon

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