Zac Efron says being confronted by a knife-wielding homeless person was the most "terrifying moment" of his life.
Efron - who endured two stints in rehab last year - was recently involved in a mysterious altercation with a "homeless guy" in Los Angeles and admits he had never been more scared than when the man pulled out a knife.
Recalling the incident, he told The Hollywood Reporter: "I had a friend come pick me up late at night -- we were looking for a place downtown to get a bite and catch up.
"We were having trouble finding somewhere - a lot of places were closed - and the car ran out of gas off the 110. It was ridiculous. We had to pull over, and I called Uber.
"[While waiting] a homeless guy, or vagrant, tapped on the driver's-side window. Before I knew it, he [my friend] was out of the car, and they started fighting."
Zac claims he got out of the car to help his friend - who was previously reported as being a bodyguard - "disarm" his opponent, and he was relieved when police arrived to diffuse the situation.
He added: "I saw that [the homeless man] was carrying some sort of a knife, or shank, and I got out of the car to disarm him.
"At some point, he dropped the knife, and I got hit pretty hard in the face - and almost instantly the police were there to break up the fight...
"It was the most terrifying moment of my life."
Following the terrifying incident, friends of the 'Neighbors' actor - who broke his jaw in a fall at home last November - admitted they were worried about his sobriety and questioned the intentions of his pal, who they claimed was actually a drug dealer.
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