1. The one instance of a
particular word in what you've written that will bring out stampeding herds of duh-weebs to point out to you the correct spelling of the word - and a few more incorrect ways to spell it - even though every other instance of the word is spelled correctly.
2. A correctly spelled word that
illiterate duh-weebs are unfamiliar with, and will mistake for
misspellings of other words.
3. The reason why spell-checkers were invented.
1. "The correct spelling of yelow is yellow."
"Maybe
that's why I spelled it that way the other 36 times I used that word."
2. "You left the P out of homepage."
"If I had wanted to call my homage a homepage, I would have."
3. "I spell
everything correctly! I use a spell-checker!"
"Spell-checkers
don't know the difference between there, their, and they're, and neither do you."