Memes
100
The 2004 YouTube video of "Peanut Butter Jelly Time" features a dancing what?
What is a Banana?
200
This meme is from a show that features time travel and space adventures. 
What is Futurama?
300
This 2013 music video trend, involves a group of people dancing or moving lightly to a specific song and when the beat drops, they dance more fanatically.
What is the Harlem Shake?
400
In the first episode of this YouTube cartoon series, released in 2005, the characters have found a map to Candy Mountain. At the end of the episode, the main character has lost a kidney.
What is Charlie the Unicorn?