Originally Posted by uno

It's not that hard to do. Staying in that place mentally is.

What others have said is true. These actors get into the headspace of the characters they play. I was at a shoot for The Sopranos last week. James Gandolfini was a great guy, but once he got into character he was fucking scary. He locked eyes with me off camera during a few takes and scared the shit out of me. Cold sweat. That guy is GOOD.