Anyone got anything else to add to the list?

To whom it will concern

"I hope this email finds you before I do"
- Oh that's good. I'm gonna have to use that one.
- Stupid. They will dig it out in court. Only personal and in private.

"I'm going to teach you that having kneecaps is a privilege, not a human right".

Tom Nook? Is that you?

Half of these are just OOP's kinks showing

I will edge you then ruin your orgasm
Like seriously OP just go watch some toe sucking watersports porn on Bing.

I will moisten your socks

Take it easy there, Satan.
You're a mean bastard. Hehe

I will grant you immortality then lock you in a box

"I Have No Mouth, and I Must Scream" dials this to 11. Even a summary is extremely unsettling.
I will grant you immortality then lock you in a box
and drop it in the Mariana Trench.
- The Old Guard 2 is coming out this year, by the way.
- Baccano spoilers! (Well, ocean, not the trench).

Enjoy your next 24 hours

General well wishes with zero actual threat that come off as extremely threatening

I used to RP a character in Ultima Online that would threaten people with "I'm going to remove your larynx through your sphincter."

Okay, I'll not comment on your comments anymore, I just realized that's extremely silly

I’ll clog your toilet

I'm going to show your toilet #3.
I will upper decker your favorite toilet

"I will stare into your eyes even after you blink".

"I want to collect your shadow"

It's from the band Craft's song I Want To Commit Murder. Pretty great black metal.

Sounds more creepy romantic than threatening, like something a stalker would say.

I always thought the idea of biting someone else's tooth out was unsettling.

Where have you heard that?! That's new and disturbing imagery to me.
- Just my head

There's a repeated line in "Once Upon A Time" that is supposed to be romantic, but taken from another point of view is very unsettling.

"I will find you. I will always find you"

I'll hit you until I pass out

"Invert your rib cage"?

Oooold.

https://en.m.wikipedia.org/wiki/Blood_eagle

"I'm about to become the reason your children will have nightmares"

I will salt your papercuts.

I will grate your cheese.

I shall end your bloodline, with a spoon.

I will grate your cheese.
I mean I'm making quesadillas so that'd be great... er, very nice of you.
the spoon thing tho that's pretty good
- "... Why a spoon, cousin?"

When asked what their biggest fear is most people say stuff like "spiders" and "heights"... And I'm always like "why is never anyone thinking about being tortured to death?" is there something worse? I doubt it

Being tortured almost to death is worse, because, once you recover, they can do it all over again
- Being tortured to death and brought back multiple times then set free. No amount of therapy will guide you out of the woods after that.
Uday gonna getcha

Where I'm from, there's the expression "you'd look good in a binbag", which is supposed to mean that you'd even look good wearing a binbag, but I've always thought it sounds like someone wants to chop you up and throw you in the bin.

I did once have someone come at me while saying "I WILL RIP YOUR EYEBROWS OUT"

"when I'm finished, you're gonna be in multiple time zones at once."

My personal favorite is:

"I will walk through you"

One of my go-to phrases is "Imma feed you to a cow".

this is a great threat, anyone who's watched cows eat, regurgitate, and re-eat, would be horrified.

You will go nicely with the lamp base I just bought.

“Blow this guy away, it’s blow this guy away”

One I've always wanted to try is "I will keep punching you until I break through your head."

I always liked Digger’s threat to Herne: ‘and furthermore, should you hurt its feelings, I will smelt ore with your bones, understand?’

Some shit Dennis would say

"I have a use for you."

I will unfuck your mother.

My favorite: Don't make me shove a straw in your carotid to see how far I can make the blood fountain shoot.

"I'll send your teeth brush to the unemployment office" or "Carmine, you sit in the front seat, I wanna stretch my legs", I for myself like to use "you have my undivided attention now", freaks people out. Don't have to use it very often, one or 2 times in my life in earnest. Add Jack Nicholson smile for good measure.

Eh, I wouldn't call those unsettling. Humorously over the top to me.

Something more akin to "I will fucking beat you until you shit yourself" is unsettling. Going with "I will shove a dildo studded with tacks in your ear" is just absurd.

"I'mma punch you so hard you're gonna forget tomorrow." heard this once tossed out, he didn't 'win' as other guy had ground game and it was quickly broken up, but it stuck with me. good ol barracks fights. everyone loses.

"I will eat your babies" stole it from always sunny. Used it once, ended a road rage incident

I will tongue punch your fart box.

I think there's a lot of people who would reply "don't threaten me with a good time". Dangerous game.
I am not one of those people, my ass is hairy and no one needs to be exposed to that literal shithole. But I don't judge other folks with freshly nair'd cheeks, y'all do y'all, I do worry about ecoli but they say it's not a problem "¯(ツ)_/¯ "

I will fuck your throat hole

it just doesn't communicate threat to people that are into it. You toss that out as you're squaring off and someone goes "Oh shit I didn't know this was foreplay-" and starts putting on chap-stick, like, that's gonna wreck your whole plan

https://www.youtube.com/watch?v=v4NTU68x2Kc