Tis the season for looking back!

Youtube released its list of most-watched videos (non-music video) of 2017. The number one viral video of the year is...drumroll, please...a singing oyster!

You probably guessed -- based on the featured image -- the most viral video was Ed Sheeran. Nope (though he did make the top five, as you'll see below). Apparently, the most watched Youtube video comes from an episode from Taiwanese singing competition The Mask Singer. Contestants battle their way through the season, singing behind full-body costumes. Only at the end - or when they're eliminated - do they reveal their faces. It's like the Guess Who of American Idol. 😂

Rounding out the top five most watched Youtube videos (non-music video) of 2017 are:

2. ED SHEERAN - Shape Of You | Kyle Hanagami Choreography

3. Ping Pong Trick Shots 3 | Dude Perfect

4. Darci Lynne: 12-Year-Old Singing Ventriloquist Gets Golden Buzzer - America's Got Talent 2017

5. Ed Sheeran Carpool Karaoke

Youtube also released it's annual Rewind video, highlighting everything in music, memes, people and pop culture in 2017.