I know exactly what you mean. There was a girl I went to high school with, who I first met when we both ran for Student Council, I for reelection, her for her first outing. She gave a stupid goddamn speech dressed as a cow. It was ret*d, but you know how high schoolers would dig that kind of silly stunt, and she won, while I lost. After that, we shared a few classes together, where I discovered what an idiot she was. In history classes, she'd ask questions like: "Was the U.S. ever socialist?" and "Did Hitler have a theme song?" A true mouth breather who I didn't respect in the least.
But she was quite beautiful, and her idiocy had a strange, endearing quality (though one that grow tiresome quickly). Even today all those years later, I'd be lying if I said I wouldn't leap right into bed with her if she gave me the opportunity.