Experiencing the least useful

So what about experience? What should you put on your resume and mention at interview? How would you describe your background to your new colleagues? To a business partner?

Only seven hundred and eleven people thought to bother wondering what the least useful experience might be and one of them mentioned mushrooms. Perhaps this is a good feature in us that we spend more time counting those experiences that were useful or rewarding than emotional or procedural dead ends.

50,600 wanted to identify 'most useful experience' so that's encouraging but perhaps a site citing learning English as the most useful experience means we might need to narrow our scope.

What is the most useful experience to have when growing chrysanthemums, fixing the solenoid or selling felt hats?
In some careers, experience is considered very important while others carry that legend No Experience Necessary