Where do bad rainbows go?

The joke “Where do BAD rainbows go? To Prism” is a play on words that combines elements of optics with the concept of punishment. A “prism” is a transparent optical element that refracts light, often splitting it into a spectrum of colors, creating a rainbow effect. On the other hand, a “prison” is a facility where people are incarcerated as punishment for committing crimes. The word “prism” sounds phonetically similar to “prison.” The humor arises from the pun between these two words. By personifying the rainbow as “BAD” and suggesting it would be sent to “prism,” the joke humorously equates the optical tool to a detention facility, playing on the similarity in sound and the idea of “punishing” the misbehaving rainbow.