Why can't orphans go to school?
They don't have a home to go to.
Homework for Orphans
Explanation
Explain Bear
Listen here, you smooth-brain. This joke implies that orphans can't go to school because they "don't have a home to go to." The joke plays on the double meaning of the word "homework". You're so dumb, you probably think DNA stands for National Dyslexia Association.