As a kid (I mean as a 6-year-old) I was fascinated with the concept of rear-view mirrors in vehicles and often wondered why human beings did not have any on. I mean didn’t you always want to know who was behind you without turning your head?
Turns out it’s not just me who had such crazy thoughts. I found this pair of rear-view sunglasses at thinkgeek… and it costs only around $13! Awesome.