Inattentional blindness

We've recently learned about inattentional blindness. Inattentional blindness is when our brain fails to comprehend or see something that is in clear focus. After watching this video: http://www.youtube.com/watch?v=b7LuvAM6XLg I was shocked to find how much in life I am actually not seeing. The three changes I didn't see were the red hankerchief changing to a green one, the magicians white shirt changed, and the assistant was actually a completely different person.
I read on a previous classmates post that they believe inattentional blindness could have something to do with having a "frantic lifestyle", and I would agree. Everyday people have so much going on in their life whether it is from going to school or work, what directions they need to take, and anything you could possibly imagine. One story that I would like to share about inattentional blindness is when I was going to take a math test. Whenever I am about to take a test I get really bad anxiety and start stressing out big time and I just want it to be over with. As I was about to take my math test my teacher was giving the instructions and specifically said "read the instructions before you begin." After she passed them out, of course I skimmed over the instructions and tried to finish quickly before I forgot anything. I started stressing out when kids were bringing their tests up in less then 10 minutes and laughing. After finishing the whole test and 50 minutes later I brought my test to my teacher. She just starred at me like an idiot and finally said, "I specifcally said read the directions. Did you not see where it said 'If you are reading this put your name on the top and hand this is. You do not need to take this test. You can leave after you see this'? I was so worried about doing well on the test that I completely blew off reading the instructions. I literally skimmed them over and somehow failed to see "YOU DO NOT NEED TO TAKE THIS TEST." -- I truly believe when you have so much going on you don't realize half of the stuff going on because you are so focused on what you think you should be focused on. I was so focused on doing well and remembering equations I didn't focus on the instructions right in my face. I never forget to read the instructions now :)