Note: Not all submissions were sent in by Community users.
1. Jon Venables and Robert Thompson
3. Brenda Spencer
In 1979, 16-year-old Brenda Spencer opened fire with a .22-caliber semiautomatic rifle on an elementary school playground outside her home, her reason simply being, "I don't like Mondays." The school's principal and janitor died. She's said that she feels partially responsible for every school shooting that has happened since.
4. Daniel Bartlam
Bartlam admitted to the manslaughter of his own mom when he was 15 years old in 2011. He beat her with a hammer in their home in England, and then he set her body on fire. Apparently, Bartlam was a huge horror fan, which police believe led to his incredibly violent crime.
5. Mary Bell
6. Joshua Phillips
7. Pauline Parker and Juliet Hulme
These New Zealand girls had a dangerously co-dependent relationship, in which they spent most of their time in a fantasy world of their creation. When their parents tried to separate them in 1954 by sending Juliet to live in South Africa, the girls murdered Pauline’s mother. The movie Heavenly Creatures is based on their story.
8. Barry Dale Loukaitis
Loukaitis was a 14-year-old student at Frontier Middle School in Washington in February 1996 when he shot and killed his algebra teacher and two students. He then held the class hostage for an hour until a gym teacher showed up, tackled Loukaitis to the ground, and helped students escape.
9. Lionel Tate
10. Jesse Pomeroy
Pomeroy often mutilated other kids with knives and belts. However, in April 1874, he took his beatings too far, killed a girl named Katie Curran, and threw her body in the basement of his mom's dress shop where it was later found. At 14, he was the youngest person ever in the Commonwealth of Massachusetts to be convicted of first-degree murder.
11. Eric Smith
12. Cindy Collier and Shirley Wolf
13. Catherine and Curtis Jones
15. Craig Price
16. Alyssa Bustamante
In October 2009, 15-year-old Alyssa Bustamante stabbed and strangled a 9-year-old girl in Missouri, because "she wanted to know how it felt to kill someone." She then threw the girl's body under a pile of leaves in a nearby forest.