lab rat
A lab rat is someone who looks like a crazy person because they’ve been injected with too many weird chemicals. They probably don’t even know what they’re doing anymore.
He was in the lab for too long and now he talks to the beakers. They’re his best friends.
She got hit with a chemical that turned her hair blue and her skin purple. Now she’s a lab rat on the outside and a monster on the inside.
He got so messed up with chemicals, he now thinks he’s a test tube. He’s also married to one.