Robert Pattinson has said he doesn't ''really know how to act'' and admits he is a "catastrophist".
The 33-year-old actor has revealed he is unsure of himself on-set and goes to extreme lengths to get in the zone before filming a scene.
Speaking to the Observer newspaper, he said: ''I don't really know how to act, I kind of wanted to somehow make it real, and one of the ways I've always thought makes that a little bit easier is if you shake up your physical state just before action. You end up walking into a scene having a different ... feeling.''
The Lighthouse actor, who also occasionally forces himself to gag prior to shooting a scene, said sometimes he would actually throw up.
"I forgot I had a mic on the whole time, so the producers and the director, before every single take of the movie, would get ... It kind of puts everyone else off.'' What did his co-star think? "I don't know, I was too engrossed in my gagging," he said.
The Twilight actor freely admits to being a ''catastrophist'' and admits in some situations his pessimistic outlook can be beneficial.
He said: ''I'm a catastrophist. I'm always thinking that the worst-case scenario is actually going to happen. So when it does happen, I'm like: 'Gah! OK! I'm prepared!'''
Pattinson also revealed he's drawn to particular types of on-screen characters.
He explained: ''I'm not entirely sure how to play, like, a normal person. I don't think I'm great at subtle.
''I like characters who, when a situation is placed upon them, their decision-making process is incomprehensible. I find it fascinating when people make bad decisions. The humour and the befuddlement.''
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