Mitt Romney: "Binders full of women" comment went viral.

Mannequin Challenge: While mostly harmless, some attempts led to accidents.

In My Feelings Challenge: People jumping out of moving cars to dance.

Tebowing: Kneeling in prayer pose in random locations led to injuries.

Ice Bucket Challenge: While for a good cause, many failed attempts led to injuries.

Cinnamon Challenge: People choking on cinnamon powder.

Planking: Dangerous trend of lying face down in unusual places.

Bird Box Challenge: People doing everyday activities blindfolded, causing accidents.

Blue Whale Challenge: Dangerous game that led to self-harm and suicides.

Kylie Jenner's Lip Challenge: Harmful trend where people tried to mimic her lips.