A guy at party who was totally off his face on amphetamine told me this while juggle 3 balls. He said the skill synchronously activated both left and right side of his brain. He was defo on the right lines and since inspired me juggle too.
Not to discount this specific tidbit, but perhaps as a rule, it's not the best practice to hold the wisdom of someone in this state in high regard. On the other hand, there seems to be a propensity for humans to do so, dating back to the Oracle of Delphi, so you are in good company it seems.