I'm going to stop numbering these things because there's one every Wednesday, and that's a lot of numberin'. Anyway, on to this week's exciting prompt: grammar!

In another thread people got to talking about grammatical pet peeves, so I figured this would be a good place to vent about what annoys you, linguistically. I have a few:

1. The verbing of nounsnon-verbs, like "addicting". The phrase "this is addicting" drives me completely insane. It's not addicting, it's addictive. (1a. Verbing of nouns is a hallmark of corporate-speak and as such it's probably my biggest annoyance)
2. Abuse or neglect of apostrophes. If you are using a shortcut to say you cannot do something, it's can't, not cant. If you are using a shortcut to say you are not going to do something, it's won't, not wont.
3. Modifying the word "unique", like saying "this is the most unique thing I've ever seen". Unique, by definition, does not require a modifier - something is either unique or it is not.
4. Saying "I could care less" when in fact you meant to say "I couldn't care less". Saying you could care less implies that you do, in fact, care.
5. You're/your misuse.

What are some of your grammar annoyances? What else is going on?