What's your least favorite common grammar/spelling error?

[Brony Number 42 10,069]

9 hours ago, mini said:

i don't really care about grammar/spelling that much but "would of" instead of "would have" does bug me

"Till" is actually a word. It's the informal version of "until." So it's not wrong to say "till." "Til" is incorrect tho. 

Yeah I checked but it still annoys me.

[OptimisticNeighsayer 478]

Any time someone confuses “they’re,” “their,” and “there.” They’re all extraordinarily common words that the context should make the correct spelling obvious. 

[The Historian 516]

Friggin' everything on that list. I get called a Grammar Nazi all the time. xD

[Totally Nyx 36,062]

Most things on that list.

This one's not on there and applies to both written and spoken forms, but does forgetting the "n't" of "couldn't care less" count?

[Sunset Rose 254]

The misuse of apostrophes. I've complained about it at length before, but the most common misuse in English that I've seen lately is to describe more than one thing.

ex. The male seahorse gives birth to the baby's.

That is so annoying to me.