Potential difference between live and neutral wire

With the light switch off, I can touch the neutral and line, or ground and line or neutral and ground and not feel anything, no shock. But if the two neutrals or neutral and ground touch/rub, they cause a static electricity type of spark. What would be the cause of this and would this be why my bulbs constantly go out. I’m getting 4.2v between the line and neutral/ground with the switch off. Can’t feel it when touching both. The neutral also goes to another light which is fed power by a third red, hot wire. Welcome to StackExchange. All due respect, STOP USING YOURSELF AS A TEST INSTRUMENT. RIGHT NOW. And don't do it again! The peculiar environmental conditions which prevented you from being killed are not reliable and cannot be counted on. If you want to touch wires and use your body to detect voltage, they make 1-wire voltage testers for that. They're basically what you're doing, except the neon light inside limits them to safe currents. All due respect, I wouldn't even do that with the breaker off. I "verify off" by flashing hot to ground. One time I did that, the whole circuit lit up again! When I subsequently flashed neutral to ground, I got a blinding arc flash! Remember you are working on circuits that are broken. As for the "pat of the fingers" test, ask anyone who works from an insulated line truck on live wires, which I do. Live wires feel like nothing. Seriously. Your test doesn't work. You keep saying "neutral and ground". A common mistake is to believe they ar...

One day the science teacher was teaching in her class, one of her student seemed very sad. The teacher asked her the reason. She told the teacher that a mishap took place in her locality where four members of a family died as they were trying to steal electricity by connecting a conducting wire with the live wire on the street.