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Going to the darkest place you can to make yourself really upset and adding that with the physicality and running around, you can work yourself into hysteria that way.

"Alexandra Daddario Talks TEXAS CHAINSAW 3D, What Attracted Her to the Project, Preparing for the Role, PERCY JACKSON: SEA OF MONSTERS, and More". Interview with Haleigh Foutch, collider.com. January 3, 2013.
Going to the darkest place you can to make yourself really upset and adding that with the physicality and running around, you can work yourself into hysteria that way.