A kid asked his mother, “Mom, can you buy me those two toys that we had seen at the store the other day?”

His mother replied, “I will buy you one of them. One is enough to keep you busy at playtime.”

Later that day, the kid started doing his homework. The mother said, “Remember that you have two activities as homework today.”

The kid replied, “I will do one of them. One is enough to keep me busy at study time.”