Every "Every X Video Playing at Once" Video Playing at Once
by Jake Eyes
24:39 - 145,800 views

The logical progression of the Freeman's Mind video I made. Let the irony arms-race begin! (props to anyone who responds with an animation of a pair of arms racing)

Top Row (from left to right)
The Simpsons (Created by romssonson): http://www.youtube.com/watch?v=MNXr3smivpo
Cristiano Ronaldo (Created by romssonson): http://www.youtube.com/watch?v=MzaPxmbkv5w
Freeman's Mind (Created by me): http://www.ssyoutube.com/watch?v=Y-7_7qOtQMg

Middle Row
Pixar (Created by romssonson): http://www.youtube.com/watch?v=szppiKNnhGA
Psy Gagnam Style (Created by romssonson): http://www.youtube.com/watch?v=GTcuRjd5TnU
Friends (Created by romssonson): http://www.youtube.com/watch?v=oelWurmyi4I

Bottom Row
Invader Zim (Created by Tha Pixeltripper): http://www.youtube.com/watch?v=eFfmuRp2gTA
My Little Pony(Created by Tha Pixeltripper): http://www.youtube.com/watch?v=zR7V_bCyZe0
Meet the Team (Created by ihasnotomato): http://www.youtube.com/watch?v=Gqbj6z6COLY

Classic Looney Tunes/Merry Melodies (All 1004 shorts at the same time) (4K)
by Omni Verse
9:48 - 218,481 views

All 1004 Classic Looney Tunes/Merry Melodies at the same time.
The classic era covers the period from the first short in May 1929 (Bosko, the Talk-Ink Kid) to the last one in September 1969 (Injun Trouble).

360° version: https://youtu.be/5eO3Z9halak

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This is clearly just for kicks and non-profit, but if you have any usage issues or claims on this please contact before whacking that hammer and I'll gladly comply. ;-)

We Are Number One but it's actually just every episode of Lazy Town playing concurrently
by PerpetualCamel
25:29 - 221,755 views

78 separate video and audio tracks

6:50 bottom right corner for "We Are Number One"