A joke my second grade teacher used to tell

Every Friday after school, a young boy named Timmy would go to the corner store for an after-school treat.

There would always be a group of rowdy older boys loitering outside the store. Every time Timmy came by they'd pull him aside. The leader would reveal a dollar in his left hand and a quarter in his right, and tell Timmy to take one. Timmy would always take the quarter, leading the boys to laugh and make fun of him.

The store owner, after watching this happen for week after week, finally took Timmy aside one day and explained to him that a dollar was worth more than a quarter, which is why the boys were laughing at him.

Timmy replied, "I know. But if I took the dollar, they'd stop. So far I've made fifty bucks."