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"

Every 007 Opening Title Song At The Same Time
by Luke Robert Lindemeyer
3:57 - 39,434 views

If you can stand the cacophony, having all 24 Bond films play at the same time is strangely beautiful to watch...

Here are the films and their songs featured in the frame from top left to bottom right:

DR. NO "James Bond Theme" Monty Norman
FROM RUSSIA WITH LOVE "From Russia With Love" Matt Monro
GOLDFINGER "Goldfinger" Shirley Bassey
THUNDERBALL "Thunderball" Tom Jones
YOU ONLY LIVE TWICE "You Only Live Twice" Nancy Sinatra
ON HER MAJESTY'S SECRET SERVICE "On Her Majesty's Secret Service" The John Barry Orchestra
DIAMONDS ARE FOREVER "Diamonds Are Forever" Shirley Bassey
LIVE AND LET DIE "Live And Let Die" Paul McCartney & Wings
THE MAN WITH THE GOLDEN GUN "The Man With The Golden Gun" Lulu
THE SPY WHO LOVED ME "Nobody Does It Better" Carly Simon
MOONRAKER "Moonraker" Shirley Bassey
FOR YOUR EYES ONLY "For Your Eyes Only" Sheena Easton
OCTOPUSSY "All Time High" Rita Coolidge
A VIEW TO A KILL "A View To A Kill" Duran Duran
THE LIVING DAYLIGHTS "The Living Daylights" A-ha
LICENCE TOL KILL "Licence To Kill" Gladys Knight
GOLDENEYE "GoldenEye" Tina Turner
TOMORROW NEVER DIES "Tomorrow Never Dies" Sheryl Crow
THE WORLD IS NOT ENOUGH "The World Is Not Enough" Garbage
DIE ANOTHER DIE "Die Another Day" Madonna
CASINO ROYALE "You Know My Name" Chris Cornell
QUANTUM OF SOLACE "Another Way To Die" Jack White & Alicia Keys
SKYFALL "Skyfall" Adele
SPECTRE "Writing's On The Wall" Sam Smith