Blind behind the back (BBB) is a trick where all the throws and catches are done behind the back. By letting the balls touch your back while they're in the air, you can tell where they are without being able to see them.
If during a pinball juggling attempt, a ball lands on top of another ball that is held in the hand, so that the ball has clearly stopped rolling down the arm before the other ball is thrown, that will be considered collecting, and thus only allowed at the end of a run.
BBB world records with publicly available video evidence:
- 3 balls: 34 minutes and 1 second by Ethan Brain in 2017 (video)
- 4 balls: 5 minutes and 18 seconds by Ethan Brain in 2018 (video)
- 5 balls: 231 catches by Zak McAllister in 2017 (video)
- 6 balls: 22 catches by Zak McAllister in 2016 (video)
- 7 balls: 7 catches by Ori Roth in 2006 (video) and Jonah Botvinick-Greenhouse in 2013 (video)