My first "love/crush/I-really-don't-want-to-remember-this-person" happened in Kindergarten. I vaguely remember it, for obvious reasons.
Anyway, I had had a crush on her for the whole school year, I thought she was cute, she had a funny voice, yada yada, ect, ect. Then one day at the end of the day, she went right up to me and kissed me on the cheek.
*STANDS IN AWE FOR 5-10 MINS*
Then my memory goes blank until the year after that, in 1st grade, when I kept telling her what she did, and that B@#$% acts as if it never even F@#$ing ever happened. I never felt the same way about a girl after that. She probably mentally scarred me for life without me even knowing it, and thus, at age 15, I STILL don't like girls that way (and for God's sake, no, I don't like boys)