Killed his older sister, was sent away, escaped, and returned to kill more teenagers.

Fell into a vat of poisonous waste, mutated, then used his powers for good rather than evil.

Killed his wife in front of his young daughter.

Sought vengeance on the girl who decapitated his mother, then killed and killed again. And again.

Killed his mother, preserved his mother, then became his mother.

Killed people under orders from his family so they could make chili with the corpses.

Hid in a toy store after being shot by a detective, then moved his soul into a doll.

Lost his daughter in a car accident, killed his daughter's surviving friend, hit by a car immediately after, and killed the teens involved in that crash.