At London premiere of the film, Jolie, 35, revealed that her kids - including Maddox, 8, Pax, 6, Zahara, 5 and Shiloh, 4 - would often come with her on the set of action thriller.
"I would bring them in early in the mornings...and I'd let them (use) blood," the Usmagazine.com quoted her as saying. "So we play together, they try on my wigs, they play with the blood. They know it's all silly! They test the harnesses and we have them flying around. They know what it is," she added.