Found here is a evolutionary mishap found in every vertebrate. The brain compensates for this blindspot by taking information from one eye and replacing it for the other. Cephalopods do not have this blindspot because eyes have evolved multiple times and in their case, the nerve came after the retina, not before. Please visit the website to find your blindspot!

Found here are more interesting vestigial mishaps.
http://www.youtube.com/watch?v=S3dtTo_8YAA


"The blind spot is located about 12–15° temporal and 1.5° below the horizontal and is roughly 7.5° high and 5.5° wide."

http://en.wikipedia.org/wiki/Blind_spot_%28vision%29