Chemistry At First Sight

I’m referring to that strong chemistry that you feel when you meet someone for the first time: Soul Mate level.  Not “oh, he’s/she’s cute, handsome, or wanna take his pants off” feeling.  The powerful connection that when you look at him/her you see right through the baby-blues (or browns) deep into the soul connection, and it’s reciprocal!  The feeling doesn’t leave for months.  I’ve had it twice, but both never grew due to circumstances.  Your story?