I believe in like at first sight, not love because until u discover that the beauty you see on the outside matches what is in the inside, u can't be in love. How many people have you met and thought were beautiful physically only to be disappointed when they spoke and their views were so different from yours. Love happens when you like what you see, like what you hear, and love how they make you feel.
I believe it can happen. Though it's never happened to me, I know it can happen to anyone, and actually I don't want it to happen to me 'cause I'm already in love and don't really want anyone else other than him. :)