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I was playing some Gmod one afternoon when all of a sudden (out of the blue) I made this movie!
but really.. I found the cube on http://www.garrysmod.org/ and it's called "harmless companion cube". From Portal. There's a version which needs portal, and a version someone else made which you don't need portal for (it has it's own custom model).
The music is from Half Life: Full Life Consequences! That vid lists where you can get it in the description (of that video, not this one.)
Music at the end is "Ragtime Warfare" from Call of Duty 4 when you put on the ragtime warfare cheat. It plays that soundtrack while you run around at double speed shooting people like in an old silent movie. Doubled with the "people explode into tires" cheat (a bad year), it's quite funny :P
btw I don't expect you to believe the crappeh storyline I made, the cube doesn't multiply, I made more of them and cut out the bits where I was spawning them. still, get the cube on garrysmod.org it's fun :P
THANKXZ for reading description, your reward is this: watch till the end of the vid for t3h prize