Wolowitz lays down on the table in order to get a tattoo on his butt. It's a shame he can't make it much further than the cold alcohol swab.
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Raj and Wolowitz go goth in order to try and pick up some chicks at the local goth bar. Nice tattoo sleeves boys!
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When Penny spends the night at Leonard's she ends up ruining oatmeal day by cooking french toast. How dare she?
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When Leonard tells Sheldon he needs to use more honey than vinegar on Penny, he tries an experiment where he uses chocolate as positive reinforcement on Penny. Amazing.
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The Big Bang Theory Season 3 Episode 3 Quotes

Penny: I'll tell you what, next french toast day, I'll make you oatmeal
Sheldon: Good lord, are you still gonna be here next french toast day?

Oh man, did the KISS Army repeal "Don't Ask, Don't Tell?"

Penny [after seeing Wolowitz in his goth outfit]