At least this brownie explains Walden's behavior. It's not baked with the usual ingrdients.
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Berta goes on vacation, forcing Charlie to get a replacement on Two and a Half Men.
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Berta sits down to talk with television producer Marty Pepper (Carl Reiner).
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Charlie and Berta sit down on the couch to watch some television and relax while Alan cooks.
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Evelyn and Berta talk to legendary television producer Marty Pepper (guest star Carl Reiner).
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When Chelsea and Alan, the best of friends, are busy cooking dinner, Charlie and Berta analyze the situation over some beers outside.
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When Chelsea moves in, Berta informs Charlie that she now works for Chelsea and he can direct his requests through her.
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Charlie helps catch Berta up on all the events that happened the the previous day... such as Rose and Alan going on a double date with him and Chelsea. Wait... what?
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Chelsea is very shocked when she borrows Charlie's phone and discovers some nude pictures on there. Good old Berta is always there for support... or to laugh at his misfortune.
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Conchata Ferrell stars as Berta on Two and a Half Men. Berta is Charlie's hilarious maid that always seems to be around.
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Two and a Half Men Quotes

Charlie: Oh, try MalibuPuddingGirls.com.
Alan: Pudding Girls?
Charlie: Trust me.
Alan: Oh ... ew.

Alan: What's the forecast?
Charlie: High tonight, low tomorrow, 100% chance of hangover.