For 18+ years, my family has been running a kettle corn business as a great side hustle.
I could talk your ear off about different types of corn, technical popping equipment, farmers market (and local event) politics, and knowing exactly which stage of the cooking cycle a batch is in just by sound alone.
What's crazy is we used to have to hand-stir the kettle wearing a welding glove and face shield. Thankfully, we now have a machine that does the stirring for us, which has saved a tremendous amount of morale, skin, and popcorn.