Shia LaBeouf vs. Justin Bieber: Who's Behaving Worse? (Poll)

Shia LeBeouf Justin Bieber - H 2014

Shia LeBeouf Justin Bieber - H 2014

Both recently "retired," the "Nymphomaniac" star, 27, now rivals the pop star, 19, in bizarre tabloid misadventures, from head-butting to skywriting to leaving empty codeine "sizzurp" bottles around the house.

This story first appeared in the Jan. 31 issue of The Hollywood Reporter magazine.

Shia LaBeouf

Physical altercation: Head-butted a patron in a South London pub over an insulting comment about his girlfriend's mother.

Communication skills: Commissioned a skywriting apology to Daniel Clowes for plagiarizing the graphic novelist.

Retirement plan: Tweeted, "In light of the recent attacks against my artistic integrity, I am retiring from all public life."

Rewriting history: Blamed Spielberg for failure of Indiana Jones movie.

Justin Bieber

Physical altercation: Egged a neighbor's house, leading cops to find pot and empty codeine "sizzurp" bottles at his home.

Communication skills: Illegally tagged walls in Australia and Brazil and wrote his initials while peeing in the snow in Colorado.

Retirement plan: Tweeted as his low-grossing documentary was released, "My beloved Beliebers I'm officially retiring."

Rewriting history: Hoped Anne Frank "would have been a Belieber."