"I hate to be a Grammar Nazi, but..."

[Magmaruby and Aquasapphire]

"coindicidence" (which I'm not sure I spell correctly this time...) I can't seem to be able to spell it...

[Pave Low]

I still don't know how to correctly spell definate/definite. At school, we learn it as definate, but on the Internet, I see it as definite or when definate is underlined in red, the top suggestion is definite, so I'm still unsure on that one.

[Elite Overlord LeSabre™]

"Necessarily" is a word I often get hung up on. But for the most part, I'm a stickler for good grammar. Which is why the shorthand used in texting annoys me to no end.

[Mr Cat Dog]

I always spell occasion wrong upon the first go. Even now, before I spell-checked it, I either put just one 'c' in or two 's's or a combination of both. I can't remember the last time where I spelt it correctly on the first try, which is weird because I normally pride myself on my spelling. It's just this one word that always seems to get the better of me, for some reason...

[Patchisou Yutohru]

The only word that comes to mind is definitely. For some reason, I almost always type it out as definately, then have to go through the strenuous effort of correcting myself.

Though, I'm sure there are a lot more that I'll misspell a lot more often than definitely if I added them to my everyday vocabulary.

[Starsprite]

I have trouble with double letter words like necessary and professor. I always try to add letters like, 'neccessary.' Oh and this isn't a misspelling, but I also overuse commas by putting them in places where I would pause to speak. I'm sure it's annoying.

I get on to people for basic grammar sometimes, too (also annoying). For example, if someone doesn't know the difference between 'your' and 'you're' I attempt to correct them in the friendliest manner possible.

[Maka Chop]

For a while, I was unable to spell "patience" correctly; I just couldn't get it right LOL. And up until about a year ago, I would put an apostrophe in the word "its" (as in the possessive, not the contraction). Glad I finally fixed that, haha.

[Hybrid Trainer]

Any word that has double letters but also has another letter that could be doubled. Or a word that has two sets of double letters. They always throw me off. So do words like Secretary because it could be pronounced se-cra-tery or se-cre-tery. I never know which vowel to use.
Also I don't know if this counts but I'm always getting confused between Their There and They're. No matter how many times I've tried to learn the differences and where they can be applied it just never seems to stick.

I don't point out spelling mistakes or grammar mistakes unless it makes it impossible to understand.

[Bloodex]

Definitely. For the longest time, I was never able to spell that, and had to substitute it with "certainly".

I also have issues with ie words... or was it ei?

[Daniel Evans]

The word "embarrass" will always embarrass me, no matter what the cost. Especially during essays in English class. I got a B+ instead of an A because of that word.

~Always.