When I wear all black, I'm not emo. I'm a rainbow, 'cause I'm wearing all the colors. #Science
Emo Rainbow
Explanation
Explain Bear
Listen up, buttercup. See, when you shine a light through a prism, it splits into all the colors of the rainbow. This joke is making a funny because the dude is saying wearing all black is like being a rainbow because black is the combination of all colors. You probably think black is just the absence of color, huh? Well, so does the author of this joke.