Years ago, I was visiting some friends for a week. One night, Mary and their two young sons had gone to bed, while John and I stayed up to watch the Bourne Identity on tv. There's a scene in the movie where one character suddenly explodes into a violent attack and destroys a room. The attack starts, the tv goes nuts with bright, flashing lights and loud noises. In the midst of all this, we hear a shriek...their oldest son, age 4, had snuck out of bed and was hiding on the stairs watching the movie. Fortunately, he didn't see anything inappropriate; it was just the sudden loud noise and lights had startled him.