Psychology: do you want to lick the science 'cause of your childhood trauma

I don't see anything wrong with licking a black hole

Anatomy and Physiology: If that's what you're into, just don't be a Hannibal Lecter

Botany: you can, but watch for thorns or poison

Kinda a repost, kinda not. This version is a little abbreviated and it left out my favorite one:

Botany:
You might hallucinate or die OR it might be delicious.

https://m.funsubstance.com/fun/403460/taste-the-rainbow-of-science/

Archaeology: It'll just taste like dirt. You might get a curse too.