I've never had a crush that crushed me, and I've never had a crush on anyone I knew well. My crushes are always kind of low-intensity.
The crush I remember best is a very recent one. I think I'd just gotten out of high school and I went to a scholarship competition at my preferred college. All the competitors (thousands of them) were filed into a big auditorium where we waited for everyone to arrive. I sat down next to this plump, poorly-dressed, nerdy looking dude. And I struck up conversation. I asked him something about our nametags, and from then on it was easy conversation. He was exceptionally laid-back, as was I, and we just hit it off really well. The thing that impressed me most about him was his skill in math; he told me he was going into the field of aerospace engineering and that he was taking tons of calculus and other math courses. I'm a simpleton at math, so that amazed me. Well, we waited for about forty-five minutes for a speaker to come in and talk to us, and during that time this guy and I just talked away. We exchanged myspace names, and when I got home from the competition he'd already friended me, I think. I just liked that guy. He had a really cool music playlist on myspace, too. Unfortunately, he was taken. Well, maybe one day we'll meet again, each of us single. (Btw I gave him the MBTI through myspace and he came out INFJ, E9. Cool guy.)
The other guy is barely worth mentioning because I never spoke one word to him, but I'll mention him because he's the closest thing I can think of to a crush. Well, our desks in my sociology class were set up in a kind of horse-shoe half-circle, so that the desks on the left and right sides of the classroom faced the desks in the middle. He was sitting in one of the desks in the middle, so I had a perfect view of his profile. I saw his jawline and beautiful face. Fell in lust. He was just pretty, but I noticed after my friend who sat right behind him pointed it out, that he didn't really wash his hair that often. That was ok. His jawline made up for that, hehe. Anyhow, he was a jokester and rambunctious and fully alive all the time; intellectual, witty, and clever. Our teacher gave us all the MBTI and posted the results in the classroom. I glanced at his type: ENTP. Makes sense to me.