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Get it on paper, and make sure it's funny to you. Then find beta readers and editors and see if it's funny to others. You can always fix something after it's written, but you can't edit a blank p...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/10190 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/10190 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Get it on paper, and make sure it's funny to _you_. Then find beta readers and editors and see if it's funny to others. You can always fix something after it's written, but you can't edit a blank page. Start writing. Figure out the joke too far later. P.S. please reference Martin Freeman, for several obvious reasons.