How can I mass produce this invention?

I invented a new type of pants where if you pull a string on the side while you fart it will activate a lighter and flames will come out of your butt. That invention show on TV hasn't accepted my invention to invest in for some reason. It works perfectly fine with minor tissue damage. How can I mass produce it... show more I invented a new type of pants where if you pull a string on the side while you fart it will activate a lighter and flames will come out of your butt. That invention show on TV hasn't accepted my invention to invest in for some reason. It works perfectly fine with minor tissue damage. How can I mass produce it and market it.
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