Shia LaBeouf continues to be the most outspoken actor in Hollywood.

In a new interview with USA Today, LaBeouf revealed he used acid on the set of "The Necessary Death of Charlie Countryman" to better immerse himself in the role.

"There's a way to do an acid trip like 'Harold & Kumar,' and there's a way to be on acid," LaBeouf said. In the drama, which co-stars Evan Rachel Wood, Rupert Grint, Melissa Leo, Mads Mikkelsen, Aubrey Plaza and Til Schweiger, LaBeouf plays a young man who falls for the girlfriend of a crime boss. During one scene, his title character gets high on the psychedelic drug. "What I know of acting, Sean Penn actually strapped up to that [electric] chair in 'Dead Man Walking,'" LaBeouf said to USA Today's Andrea Mandell. "These are the guys that I look up to."

That LaBeouf would be so forthcoming with details about his acid use shouldn't be too surprising. The "Transformers" star has turned speaking his mind into a cottage industry.

In a recent interview with THR, the actor claimed he was finished making blockbusters.

"There's no room for being a visionary in the studio system. It literally cannot exist," he said, before adding, "[the studios] give you the money, then get on a plane and come to the set and stick a finger up your ass and chase you around for five months."

Previously, LaBeouf blasted "Indiana Jones and the Kingdom of the Crystal Skull" (something that strained his relationship with director Steven Spielberg) as well as Michael Bay's "Transformers: Revenge of the Fallen."

"We have a great relationship because we can tell each other the truth about anything -- whether either one of us wants to hear it is another story," Bay told USA Today. "Shia will always be like a younger brother to me."

LaBeouf stars in this week's "Lawless," the first of many indie-minded films on his resume. In addition to "The Necessary Death of Charlie Countryman," LaBeouf is also set to appear in Robert Redford's "The Company You Keep" and Lars Von Trier's "The Nymphomaniac." That latter film will reportedly feature real, onscreen sex.

For more on LaBeouf's career turn, head over to USA Today.

[via USA Today]

RELATED: LaBeouf and More In Exclusive "Lawless" Images

Loading Slideshow...
  • 'Lawless' Posters

  • 'Lawless' Posters

  • 'Lawless' Posters

  • 'Lawless' Posters

  • A still from 'Lawless'

  • A still from 'Lawless'

  • A still from 'Lawless'

  • A still from 'Lawless'

  • A still from 'Lawless'

Also on HuffPost: