Neutron
From Slackerpedia Galactica
A Neutron is one of those particles inside the nucleus of an atom. It has about the same mass (or energy) of a proton, but has no charge.
A Neutron walks into a bar and orders a beer. The bartender gives it (remember, it's a Neutron) a beer. The Neutron reaches into it's pocket to pay, but the bartender says, "No, no. For you, no charge."
