To make sense of what takes place in this video, one must acknowledge that it is epic on more than one level.
For starters, this guy is juggling. Juggling is difficult, even if you're using round balls without corners that fit into the palm of your hand. His juggle mechanism of choice is the Rubik's cube, which are quite large and have plenty of awkward corners to make things difficult when you're trying to toss and grab, all at the same time..
But he doesn't stop there. Not only does this guy know how to juggle, he knows how to solve Rubik's cubes. What's more? He knows how to solve Rubik's cubes while juggling them.
Nope, it still doesn't make any sense.