LOL, I guess the answer to that depends on whether you ask me or my husband. We met when his fraternity--ahem--kidnapped our pledges. He swears up and down that he saw me across the proverbial crowded room and immediately told his brother, "That is the girl I'm going to marry."
I, on the other hand, do not remember even being introduced to him that night! It didn't take me too long to come around, though. I knew I was head over heels for him by our second date...and I knew I was going to marry that man within 2 months.
I really think that "love at first sight" depends on the sort of disposition you have. It happens for some, but not for others. I don't rule it out...when it comes to love, anything is possible!