Phosphenes

A phosphene is an entoptic phenomenon characterized by the experience of seeing light without light actually entering the eye ...

"Hay, what are those stars called when you rub your eyes?"

"Ohh, they're called phosphenes."

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phosphene

This is someone who is addicted to phos, also known as phosphate.

"Hey, are you addicted to phosphate right now?"
"No, it's an interesting rock. I just love it."
"Sounds like you are, you phosphene."