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Galifianakis, 52, has two sons - aged four and seven - with his wife Quinn Lundberg and has told them he has a very different profession indeed.
Speaking to Entertainment Tonight, he joked: "They shall never know of it. I'll just deny it.
"I'll say, 'I don't know what you're talking about. I had nothing to do with that movie'.
"My kids think I'm a librarian somewhere. They don't even know. They think I'm an assistant librarian somewhere."
Galifianakis went on to say he would 'get to that point' of telling his kids about his involvement with the 2009 film eventually, but admitted it's a 'tricky' situation.
He went on to explain: "You wanna protect their innocence as much as possible. They're just children.
"People used to come up to me and be like, 'Oh, my kids love The Hangover,' and I'm like, 'You're a terrible parent.'
"They need to mature a little bit before they see that."
It seems his children might have more luck watching their old man's latest film Ron's Gone Wrong - a story of friendship in the age of social media that follows Barney, a socially awkward schoolboy and his malfunctioning digitally-connected device Ron.
Galifianakis said that he tries to 'stay away' from social media. Speaking to the PA news agency, he said: "It's not that I don't understand it, it just seems very noisy and there seems to be a lot of people disagreeing - and some of those people are robots.
"There's just not enough validity in it to me, so I ignore it."
He went on to talk about a time when he overheard a conversation between two teenage girls about their mobile phones.
He said: "I hear one of them go, 'Ever since Stephanie talked me out of having a cell phone, my life has gotten a lot easier.'
"And I'll never forget that."
He said he thinks it is 'remarkable' for it to be unusual for a teenager not to have a mobile phone.
He said young people are being 'burdened' with problems and are 'not allowed to be kids'.
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