The neutron asks the proton if he would like a beer. He thinks for some time (he doesn't usually drink you see, but as he was with his good friend the neutron, he decided to treat himself) and said yes.
Seeing his friends indecisiveness, the neutron asked, ''Are you sure?''
Another ponderous glance and then a quick reply ''Yes, I'm positive''
The neutron smiles and nods, walks to the bar and asks for two beers. The barman, who knows him well (the neutron is a rather popular particle in those parts) pronounces ''For you sir, no charge!'', to the envy of the other customers. The neutron and the proton hence became best friends.
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