Thanks. Send me money for 1st class airfare + a month's stay at a 5 star hotel, and I'll be there ASAP.

You're actually using close to 95% of your brain this time, he he.

the 10-20% of your brain notion is nothing more than a myth based on misunderstandings
even at rest doing nothing there is significantly more than that being used because the brain does so much more than we give it credit for without us consciously knowing it, from monitoring blood pressure and regulating heartbeat accordingly, maintaining our breathing and our digestion, maintaining body temperature, coordinating our other senses, processing visual/auditory input, coordinating our other senses, maintaining our balance, and of course we daydream/talk to ourselves in our head etc... even not consciously doing anything requires a significant amount of our brain's capacity, nowhere near 100% but well more than 10-20%.