01:41 AM EDT 12/22/2014
Originally posted 09/05/2012 04:30PM
Bradley Cooper lives a relatively tame life these days, but that wasn't always the case.
The actor, 37, who stars alongside Zoë Saldana in The Words, has calmed down a lot since his 20s.
On one occasion, "I was at a party, and deliberately bashed my head on the concrete floor," Cooper recalls for the Hollywood Reporter in its Sept. 14 cover story. "Like, 'Hey, look how tough I am!' "
Top 5 Most Voted Stories
Bobbi Kristina Brown Suffers 'Violent Seizures' After Being Taken Out of Coma
Kardashians Ink Multi-Million Mega-Deal with E!
Leonard Nimoy Has Died
Inside the E! Scandal: What's Next for Giuliana Rancic After Zendaya Controversy?
Severely Malnourished 8-Year-Old Twin Girls Rescued, Mother Charged with Abuse
Top 10 News Categories
The most buzzed about stars this minute!
Treat Yourself! 4 Preview Issues
More On PEOPLE.com
Got a News Tip?
Send it to our People.com editors!