A dishevelled old man enters the bar. The cloth bag dangling from his hand must be heavy. It makes him walk lopsidedly as he makes his way to the bar. He heaves the bag onto the bar with a loud thump.
"Frank's the name. Just staked my claim. There's ore in them there asteroids. Man can make a respectable living from mining. But you gotta watch for the snakes hiding in the rocks!.. Honest work sure builds a mighty thirst"
He tips the top of the bag over and worthless rock chips cascade onto the bar surface. He has a hopeful look in his eye "You accept rocks?"
You get one drink, old-timer. Behave yourself.