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After recently revealing that he was prepared to have real sex in Lars von Trier's explicit film Nymphomaniac, Shia LaBeouf is now admitting that he took a real acid trip to prepare for a scene in another upcoming film. 

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The Transformers star -- who is currently on a break from big-budget movies to focus his career on independent film projects -- tells USA Today that he used acid on the set of The Necessary Death of Charlie Countryman to better grasp his character, who gets high on the the psychedelic drug. 

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"There's a way to do an acid trip like Harold & Kumar, and there's a way to be on acid," LaBeouf said. "What I know of acting, Sean Penn actually strapped up to that [electric] chair in Dead Man Walking. These are the guys that I look up to."

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In The Necessary Death of Charlie Countryman -- which co-stars Evan Rachel Wood, Rupert Grint, Melissa Leo and Til Schweiger -- LaBeouf portrays a young man who falls for a woman who's claimed by a violent crime boss. 

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Speaking recently about the requirement to have sex for real in Nymphomaniac, LaBeouf explained, "It's going to be a wild movie. There's a disclaimer at the top of the script that basically says we're doing it for real. Everything that is illegal, we'll shoot in blurred images. Other than that, everything is happening."