Challenge us with a non-famous line from a movie

Correct! It’s from the first Despicable Me, when he and Margo start matching wits as soon as he takes the girls home.

“You fucked with the wrong Marine!”

A Few Good Men

Correct.

Even though I’m not a Marine, I angrily yelled that at the cops I felt were mistreating me when I was in psych treatment at the hospital in '22. Many times.

It’s not directly relevant to your question, but I love the fact that in Godzilla (2014), the big G literally does rip off the head of one of the MUTOs and then breathes fire down its neck. It’s the closest thing I’ve seen to actually performing the act that’s threatened.

https://www.youtube.com/watch?v=nglTPbYIhf0

The second version of Moulin Rouge ?

Trading Places? I seem to remember the bad guy that ended up in the gorilla suit with this line or something similar.

Close! Clarence Beeks says, “I’ll rip out your eyes and piss on your brain!”

Nope.

New one:

“And what happened to the cattle?”
“I don’t know; I never got a straight answer. All I know is that their teeth fell out.”

‘Guess who’s coming to dinner…’

So you’re telling me you made a porno where the point is the plot?

Star Trek VI: The Undiscovered Country. Chekov said it.

Correct!

“Don’t screw around, Otter, they’re serious this time.

Relax, man, I’m pre-law.

I thought you were pre-med!

What’s the difference?”

Animal House?

No one? Let me offer a different line from the same movie:

Fine. I’m done. Put a fork in me… . Don’t really put a fork in me.

Correctamundo!

It sounds really familiar but I can’t place it.

In the meantime here’s one of mine that never got guessed … with a new line.

“And what happened to the cattle?”
“I don’t know; I never got a straight answer. All I know is that their teeth fell out.”

“Nope, it isn’t Hell either. Actually, there is no Hell. Although I hear Los Angeles is getting pretty close.”

Zack and Miri Make a Porno?

Or is that too obvious.