Aw, kids kill the darndest things ... at least in the movies. The latest minor murderer is the central role in Hanna (opening in theaters today): Saoirse Ronan plays the titular young girl, trained by her ex-CIA dad (Eric Bana) to be a coldhearted assassin. In order to get in the mood, we assembled a montage of the many other tiny killers we've seen in horror flicks and thrillers through the years. From the scalpel-wielding toddler Gage in Pet Sematary to the hammer-happy Esther in Orphan, it's clear little hands can do a lot of damage. Watch these precocious maniacs excel at their bloody hobby. Were they ever so small?