Sebastian Van Stockum -- the Connecticut man accused of killing his mom -- once took a high school Forensic class that had the trappings of a Jeffrey Dahmer crime scene with simulated blood spatter, dead bodies, and human skeletons, according to a former classmate. The ex-classmate tells TMZ she was in the same Forensics class with Stockum back at New Canaan High -- where the lessons included blood-spatter experiments in which students would stand on tables with a ruler and squirt fake blood to