1. I'm behind you, and you have virtually no hindsight.
2. I am right in front of you, but you're clueless.
3. I'm on the outside of a computer typing this and you're on the outside of a different computer reading it after it has been typed, but if you had read it sooner than you probably could have seen me.
4. I go about my daily life surrounded by one-way mirrors.
5. I am time.
6. You do not have a valid ticket for admission.
7. I am the plot of a Broadway musical.
8. Because you're an ass. Asses have no eyes.
9. I am your path to success, but you have no strategic vision.
10. I'm holding your still-warm eyeballs in my right hand, and all you can do is scream and complain.
11. I am your fatal flaw, and you're in denial.
12. I am metaphorical, and you lack abstract reason.
13. I've recently come down with a severe case of invisibility.
14. I am the best idea you never had.