With 103 confirmed kills, Charles Benjamin Mawhinney holds the record for most enemies taken down by a sniper in the history of the U.S. Marine Corps.

Antron Singleton, also known as Big Lurch, was high on PCP in April 2002 when he killed his roommate Tynisha Ysais because he thought the devil was inside of her.

Dawn Brancheau was killed while performing with an orca named Tilikum in Orlando on February 24, 2010 — and SeaWorld never allowed humans into tanks with killer whales ever again.

A fisher cat is not a feline and it does not catch fish, but this weasel relative is one of the most powerful hunters in North America.

Hailing from Mardin, Turkey, Sultan Kösen stands a whopping 8 feet, 3 inches tall — and holds the current Guinness World Record for being the tallest living man.

In November 2012, Shanna "Liz" Golyar murdered Cari Farver, then spent the next three years pretending to be her while sending tens of thousands of texts and emails to their shared love interest.

In 1920, the two psychologists behind the Little Albert Experiment performed a study on a nine-month-old baby to determine if classical conditioning worked on humans — and made him terrified of harmless objects in the process.

A child singer and dancer, Esther Jones inspired Paramount to create the cartoon character Betty Boop in 1930 — but she never received any credit or royalties.

Vicente Carrillo Leyva was warned by his infamous father, Amado Carrillo Fuentes, not to go into the family business — but he couldn't resist and was eventually arrested for his crimes in 2009.

Elephant birds stood a towering 10 feet tall and weighed up to 1,700 pounds, but they were gentle giants who disappeared completely about 1,000 years ago.

Also known as the "French Angel," wrestler Maurice Tillet was stricken with acromegaly which caused his hands, feet, and facial features to swell to enormous proportions — and is rumored to have inspired Shrek.