Ken Cheng's pound coin gag voted Edinburgh fringe's funniest joke
Comedian who quit Cambridge University for online poker says both his careers are based on 'extreme punishment or reward'They say comedy can be found in the most banal of subjects, and the 2017 winner of Dave's Funniest Joke of the Fringe award puts that theory to the test.Proving that even money can be funny, Ken Cheng has won this year's accolade with his one-liner on the UK's redesigned currency: "I'm not a fan of…