God People are Stupid

Why do people wear sunglasses indoors, they are called sunglasses not lightbulb glasses. I can understand running into a gas station or c-store but if you are indoors for more then five minutes why keep them on. There is a guy in my computer classes that does this, he wears sunglasses for the entire four hour class. even if the teacher turns off the lights to go through slides for three hours. There he is, in the corner of the room with his sunglasses. Then when the teacher turns the light back on and we are blinded for three seconds. He declares "This is why I always wear sunglasses." Why? So you aren't blinded for three seconds, I doubt something will happen in those few seconds where you need to see. Stupid people piss my off.