Most of us learned this lesson as 5-year-olds, shaking our heads at reruns of Scooby Doo as Shaggy and Scooby ran in circles away from spooks while the rest of the gang gathered clues. Those that didn't might end up like the cast of The House on Haunted Hill (if you're lucky, the tamer 1959 version), being picked off one by one by the movie monster of the week. "Strength in numbers" might be a tired cliche, but its more appealing than "dead as a doornail."