A tachyon asks for a drink.
A proton walks into a bar and orders a drink. The barman asks "are you sure?"
The proton replies "Yes, I'm positive".
A neutron walks into a bar. The barman pulls a pint and the neutron asks how much.
The barman replies, "for you, sir, no charge."
Later, a neutrino walks through the bar.
A tachyon walks into a bar.