The pharmacist had more cash behind the counter, and gave her $25 in singles to make up the difference. Meanwhile, the boy's two friends, approximately the same age, came in eating their sno-cones. The clerk gave them their money, and they thanked her and raced out of the store.
The clerk, the pharmacist and I looked at each other, and finally I said aloud what we all were thinking: "I know what they'd be doing in ten or fifteen years with the singles, but what are they doing at THAT age?"
When I got home, John gave me what was probably the correct answer: arcade change machines often take only $1 or $5 bills, and larger bills attract attention.