A boy came to his mother and asked her “Mom, where did I come from?”
The woman explained intercourse, insemination, conception, pregnancy and birth to her son in easy-to-understand terms. However, he still was puzzled, so she asked him “Do you understand what I said?”
The boy replied “Yes, I do, but what I want to know is where I came from. Jimmy in my class says that he came from Phoenix, so where did I come from?”