Have you ever wondered what it must feel like to be the best in the world at something?

To know how sprinter Usain Bolt or figure skater Yuzuru Hanyu feels? To know that, of all the 7.7 billion people in the world, you are the undisputed No. 1 at a particular activity?

"I knew it would be very difficult for me to become the world's best at a sport in the Olympics, but I thought I might be able to break a Guinness World Record," says Yui Fukuda, a 26-year-old systems engineer from Chiba Prefecture who broke the world record for most facial tissues pulled out of a box in one minute in January this year, setting a new benchmark of 135.