Charlie plays the piano while Alan sings some classic holiday songs and looks like embarrassing Evelyn in the process.
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Evelyn and Berta talk to legendary television producer Marty Pepper (guest star Carl Reiner).
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Alan helps show Charlie some dancing tips so he won't look like a fool at dancing class... and instead will at home.
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Charlie questions his entire manhood when he fails to give Chelsea an orgasm during sex. Poor guy.
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After Charlie sets a wedding date with Chelsea, he finds himself at a bar with Alan and soon in bed with him and a stranger.
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When Chelsea has back problems, Alan, as a chiropractor, helps Chelsea and goes so far as to suggest a boob reduction.
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A very upset Chelsea comes into Alan's room to complain. Alan just seems kind of scared.
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Charlie sits down with his fiancee, Chelsea, and her old college friend, Gail (Tricia Helfer), who's in town visiting.
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Two and a Half Men Quotes

Charlie: You're like an Alzheimer's patient in a whorehouse.
Alan: What do you mean?
Charlie: You're constantly surprised that you're getting screwed, and you don't want to pay for it

Alan: What's wrong with him?
Berta: Classic case of va-jay-jay fever.
Alan: Colorfully put. I'm just surprised to see Charlie fall for it.
Berta: Sooner or later all men fall for it. How do you think I got my condo in Palm Springs?
Alan: You have a condo in Palm Springs?
Berta: No, figure of speech. Don't try to stop by.