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Make you perform a challenge that's possible with two hands but impossible with one.

See https://www.youtube.com/watch?v=9aMXEOAvfb4



What happens when people try to do this while driving with their knees?


Or, people who don't have two hands?


Man without arms denied loan because he can't provide finger prints

http://www.bbc.co.uk/newsbeat/article/38077013/man-without-a...




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