My favorite is number 26: Are half of these terms even real words?
But number 27 is a close second: Why does Microsoft Word not appreciate my language skills? There are red and green lines everywhere.
Number 27 is the story of my life as I edit all kinds of interesting stuff with lots of technical terms. And that is also why number 26 is so relevant: I'm not always sure what is a typo and what is a technical term. Yesterday I had to e-mail an author to check on a word that I hadn't ever seen before. It turned out to be a typo, but it looked enough like a technical term—and was placed in a context where it could well have been—that I couldn't be sure!