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: For every gorgeous woman out there's a guy tired of banging her.
Alan: But that guy is never me.

Yeah, hi. I'm watching your commercial cash for gold and you just showed a woman selling her wedding ring for $500. No, I don't want to sell gold, I want to meet her. She's hot and we know her marriage isn't working out.

Charlie