Kind of. I don't think that I should because you should know a person's personality and you can't know anything about them after one look. However, one time the first time I saw this boy, I felt like I knew him. After that, we did have something, but it didn't last, so I'm don't think you'd consider that love at first sight. Basically, I don't think it exists because you can't know everything about someone with one glance and that's what the term "love at first sight" displays.