Stupidity: While Mr. Butler was upstairs taking a shower, Lucas goes into his house, kills his wife, and takes the baby to the school (into Mr. Butler's classroom). Lucas wanted to take away Mr. Butler's family, so all he needed to do was also kill the baby at the house (or leave the dead baby outside on the porch for Mr. Butler to panic while searching). Lucas could have left the house without getting caught for committing a double murder; instead, he keeps the baby alive and assumes Mr. Butler will know he took the baby to his classroom. (01:17:53)
Stupidity: While "sneaking" away from the school during the talent show, Susan squealed her tires pulling out of the parking spot (which wasn't in the best place for sneaking out). She speeds out of the lot and down the road, squealing her tires again making a sharp turn and cutting off a driver. These are ways of drawing attention to oneself and increasing the chances of being detected. (01:22:32)
