What were the most popular videos of 2017? Written and performed by Mick Konstantin, a 24-year-old teacher from Kildare, the simple ditty quickly went viral the weeks before McGregor's record-breaking bout with Floyd Mayweather in August.
The incident took place at the Steveston Wharf in Richmond, B.C. Michael Fujiwara, the man who shot the video, told The Canadian Press at the time that he was just filming the creature swimming before it lunged at the girl. "I've never seen anything like that before".
Explaining the system, YouTube said it bans content which "promotes violence or has the primary objective of inciting hatred against individuals or groups based on certain attributes", as well as "content meant to recruit for terrorist organizations, incite violence, celebrate terrorist attacks, or otherwise promote acts of terrorism".
Viewers all over the world flocked to YouTube to watch the shocking footage.
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Trump, Democrats to meet to avert government shutdown
They argue a three-week spending bill would put Republicans in a better negotiating position. Many Republicans want to see the cap on defense spending raised.
But YouTube has now placed the powerful video in "limited state" - a condition created to severely reduce the potential audience for "borderline" content. Videos placed under this system are unsearchable, impossible to embed on other sites, and removed from users' recommended videos lists.
Eminem's fiery freestyle rap about U.S. President Donald Trump, which aired at the BET Awards, lit up the Internet in October. We gathered to watch as April the Giraffe gave birth to her baby, Tajiri, live in front of an audience of 1.2 million, setting a new record for the most popular livestream on YouTube.
Each December, YouTube releases a "Rewind" video recapping the year in video.
Also featured in our top ten list, which does not feature major label music videos, are two Carpool Karaoke videos, Melissa McCarthy impersonating Sean Spicer on SNL and Jimmy Kimmel interviewing the famous "bat dad" family.