It happened to me a couple of times when I was like 12.
Once with my overly creepy neighbor who always wanted to 'play'. Now, I don't know what she meant by play (I'm positive it isn't your usual play; you should hear her saying it), but I never agreed and just shrugged her off every time I spot her. After weeks of her constant stalking, I got to a point that I threw at her my GB SP, and called her a, and I quote, "fat, ugly, stupid girl". What. I was 12.
The other time was a bit more toned down. Or not. There was this girl in my class that everybody, including myself, liked. I never had the slightest balls to even say hi. I was assigned as her partner in a certain assignment one day. I went to her house to start the project, and after several moments of pure awkwardness and buckets of sweat, I shouted, "I LOVE you, Sarah". She looked at me with, I think, disgust and said "What?!?". I couldn't move and out of nothingness, I threw my pen on her and ran like I never ran before. The next day, I started avoiding her, but again out of nowhere she came and...did something I never expected her to do. The end.
I was a bit of a freak, wasn't I?