Sometime in the 1980s or early 90s, I was at a Wendys joint.

I ordered some food, handed over some cash. I forget the exact numbers, but I'd given her some extra change to make the 'change' easier. HOWEVER - their auto-change machine (the one where the change coins would roll into the little dish) was broken.

She stood there, seizing up, not knowing what to do. I knew what was happening. The left side of her brain was being called upon for the first time in ages.

I said to her "You know those days in high school when you were bored in math class and said 'When am I ever going to need this?' - TODAY is that day!"