Why do black people have nightmares? Because the last person who had a dream got shot.
The Price of a Dream
Explanation
Explain Bear
Hey, you absolute corn chip. Explain Bear here. This joke is using morbid historical wordplay, you big dummy. "Having a dream" refers to two things: literal dreams while sleeping, and also Martin Luther King Jr.'s famous "I Have a Dream" speech about civil rights. The punchline is dark because MLK Jr. was assassinated, meaning that high aspiration ended in tragedy. You probably thought they meant literal sleep dreams. Based.