YouTube clips vary from music videos example: An Unexpected Song - Dame Kiri Te Kanawa
to science videos, example: Nature by Numbers - Cristobel Vila
to advertisements, examples: Old Spice and Sony
to 'home' videos examples: 'Where the Hell is Matt?' and 'Ninja Cat' and 'Four Seasons River'
to little commercial movies example: 'Granny O'Grimm's Sleeping Beauty'.
These days there wouldn't be many inter-netters who had not visited YouTube and watched something that they enjoyed.
There are many wonderful, odd, quirky, weird or just plain delightful clips that have gathered so much momentum, that they have 'gone viral' - or spread throughout the internet world, to the point where people quote extracts from them in conversation, and nearby total strangers laugh.
Example: Charlie Bit Me. (as of writing this clip shows 223,505,698 views)
Then you have the related phenomenon of people taking a viral clip and mucking around with it. This is called a 'remix'.
Example: A double rainbow. A double rainbow remix.
And now, an artwork from a viral clip. This one is simple, but I think there's great potential.
Example: original clip - Mocha's first broccoli.
And here is the art:
Stumbled upon just now: Granny O'Grimm's short reaction on hearing about 'her' nomination for an Oscar.