I hear this sometimes in songs or sometimes it just happens to me, where I play a note and hold it out with vibrato, but when I played it I hit where a pinch harmonic would be, and after a second or two it ascends the octive to where the pinch harmonic would be. Is this a real and common technique? Or is it an effect? Or is it just something that happens? Is it a good idea to refine this and use it in my own songs?
I notice this when I use lower-output pickups sometimes, but mine are low enough that pinch harmonics are very difficult.