Fellow Grammar Nazis and word-lovers: What's the most basic, frustrating grammatical pet peeve that you see on the internet every day, that's slowly killing you?

The hyphen indicates that you're talking about people who love words as opposed to words that are engaging in coitus.

Complete sentences that follow a colon should be capitalized.

That last comma indicates that we aren't talking about "every day that's slowly killing you," but rather about "frustrating grammatical pet peeve."

Finally, "Internet" should be capitalized, because we really don't want to piss it off. That's not a strict grammar rule; that's just common sense.