I have a Standard Jazz bass and when I'm typing like this, sometimes the skin a bit above my elbow touches around the 15th fret and I get a shock. I don't get a shock when I'm playing regularly and I touch the fret. It could also be the string but I also don't get shocked touching the string. Also, when I wear shorts and the fret touches my leg I get a shock. I used to think it was because some frets were sharp but I'm pretty sure it's a shock.