To show them off, to hide behind them
Because when you're cool, the sun shines all the time!
Only when I'm hung over and can't stand bright lights then
Meh, I haven't had to do that since the 60's and early 70's.
Because I'm so bright, if I don't wear sunglasses, I'll blind myself.
To try and hide the fact that I'm so stoned I can't see strieght, does not work thou case I can't walk or speak either or spell for that matter.
To hide my tears when I'm feeling down