I have two:

I pronounce the d in Wednesday. Like wedns-day.

Vagaries - vag-air-ees. I think this is an Irish thing.

I pronounce milk like melk. Is it wrong, definitely but I’m not gonna change it at this point

I say the word pecan differently depending on what I'm talking about. If it's just the pecan itself I say it like pea-con. If it's a pecan pie I say it pea-can. Not sure why. I also live in a place with a bunch of pecan orchards so the word comes up fairly frequently.

I'm fluent in both Spanish and English (obv). When speaking English, I'm conflicted on whether I should pronounce Spanish loan words in a shitty English accent like everyone else, or in a proper Spanish accent. So instead I pronounce them as horribly as I can.

Jalapeño is "yah-la-PEEN-oh". Fajita is "fa-JAI-tah". Quesadilla gets "QUAY-sah-dilah"

(As a joke of course)

.ǝdoɹnƎ uᴉ ƃuᴉʌᴉl uɐᴉlɐɹʇsn∀ uɐ ɯɐ ᴉ ʇnq .ǝɯᴉʇ ǝɥʇ ll∀

As an American, it didn't click for me until I visited London for the first time why names like Leicester and Gloucester were pronounced the way they are by Brits. My dumb American brain sees the names as Lei-cester and Glou-cester rather than Leice-ster and Glouce-ster.

Living in Los Angeles as a white person, I refuse to pronounce street and city names that are Spanish the English-speaking way. Knowing Spanish since I was a kid from school and using it on a daily basis, my brain simply doesn’t butcher the pronunciation by default.

It’s caused confusion though for sure. I used to live near a street called La Tijera, but Americans pronounced it almost like Spanish “la tierra” which is a completely different word, and I couldn’t figure out where this street was that everyone was talking about.

I don't personally do this, but many people in my family say the days of the week with "dee". Like "Sundee", "Mondee". I think it's charming, but one of their children said they were weird for saying it that way.

Also, as a programmer, there are some words that programmers use that are abbreviated which I refuse to pronounce the way that others pronounce them because I think it's weird, but virtually everybody pronounces them different to me.

For example, there is a common keyword in programming languages called "enum", and most people I know pronounce it as "EE-num", like it rhymes with "ME dumb". But "enum" is short for "enumeration", so I pronounce it as if it's the first two syllables of "enumeration", like "ee-NUUM". Although I think the normal pronunciation is weird, I don't say anything to people. I just pronounce it the way that I think it should be pronounced. But on multiple occasions, other programmers have called me out for it and asked why I pronounce it "wrong".

There are several other programming terms like this, but they don't immediately come to mind. Enum is the most common example.

Solder. I taught myself, never really talked to anyone about it, and for like a decade, I pronounced it like it's spelled. With an L.

I just can't break the habit

My wife says I pronounce crayon wrong. The way she says it, it's a single syllable word that is the same as the first syllable of cranberry. I say it as two syllables: cray-on.

Being fully honest, I've started drawing it out and articulating both syllables more because I know she doesn't like it.

Yosemite rhymes with Vegemite. Change my mind.

US American. I've lived overseas a long time and pronounce the 'h' in 'herbs' because, as Eddie Izzard once said, "it's got a fucking 'h' in it". I don't know when I switched but my mom laughed at me when we had a call recently.

One I only noticed a couple years ago: turmeric (was saying, and still frequently hear) 'toomeric'.

Ever since that IT Crowd episode I can't not pronounce pedestal as "pedal stool".

The mountain range on the eastern side of the U.S. is the 'apple-at'chans'. At least nearly everyone from the southern end of them say it that way (source: I'm from there).

'Apple-ay-shuns' is just as strange as saying 'Nor-folk'. Immediate indicator of you're an outsider.

Garage.

GraJ

Catch shit for it all the time, but at this point I think it's more like a harmless Easter egg.

My grandma rolls the R in "Three", and it's become a game to get her to say it. She handles it with great humor.

I'm cool to have my own version of that.

sometimes I accidentally pronounce "C'est la Vie" as "sest lah vy" even though I know its "say la vee" just because I read it first and it lives in my head as that first wrong pronunciation. confuses the hell out of people and I have to explain my foolery