@bam94 15 July 2021 more from that month

A proton, neutron, and electron walk into a bar. The proton orders a drink, and asks how much it costs. The bartender says, "five dollars." Next, the electron orders a drink and asks how much it costs. Again the bartender says, "five dollars." Finally the neutron orders a drink and asks how much it costs. The bartender says, "for you, there is no charge."