Way back, I used to work at a service department for the city that I lived in. I had normally worked summers and gone back to school. My last year, the head of the department let me stay on for leaf season in the fall and work the weekend (Saturday). My responsibilities were mainly to keep up the lawn, so cutting grass, blowing glass and weed whacking. For everyone else, it was leaf season, meaning they drove the trucks around to suck up the huge leaf piles on everyone's tree lawns.
I didn't help because I wasn't on for leaves, I was on for cutting grass, and so I got paid the grass rate which was less than the rate for leaves per hour. Doing leaves is hard work, you have to mostly rake the leaves to the suction tube rather than moving the tube. In the Fall in Cleveland, it's usually wet as well, making the leaves heavier.
The one day, the crew asked for my help as they were behind and needed to catch up. They were salary since they were full time, I was part time, and so hourly. My response to them was, "no". I got sour looks from most everyone, but one guy spoke up, "no way, 100%, he isn't helping".
Now whenever someone makes mention of "one hundred percent" I usually think back to this moment. Was I right? I think so. Regardless, someone else thought so too.