We’re studying ‘light’ in science class and the teacher asks if she’s clear
“No ma’am, you’re opaque.”
The Window Washer
So there was this window washer who was asked if the glass he was washing was opaque and he replied it wasn't clear. His friend sees the remark as funny and asks if he had meant to make a pun and the window washer says, "Nope, unintended"