Sometimes it happens even below the arc breakdown voltage via air... Air molecules are slightly less dense along the surface of a smooth flat surface due to molecular 'bounce', so electrons creep along the lower density of a surface.
So... something weird happened with my phone, and I thought I clicked a link for electricity solving a maze and got this instead and it was... a uniquely confusing experience.
But also weirdly nostalgic for back when confusing things happened on the internet all the time so... thanks?
Silicon isn't a conductor, it's a semiconductor. Also conductivity is dependent on temperature, hot stuff usually conducts easier, though some things conduct easier when they are colder. Even at the low voltage it's more complicated than "Conductors" and "Insulators" we learn in those ultra basic electronics guides online (or in school if you're lucky).
Except superconductors often conduct better when they are cold (unfortunately, would be nice if a room temperature one was found but probably isn't going to happen).
If electricity is a highway, current is the number of cars at any given time, voltage is how fast they are going, and high voltage are the driving sequences from The Transporter / Fast & Furious movies.