Sometime back during prohibition Bing and Bob developed a powerful thirst for some moonshine.
Bing said, "I have a brother who lives up in the Carolina hills who has just finished setting up a little operation. Perhaps he'd let us try out some of his first batch of hooch."
The two buddies hit the road to Carolina and tracked down Bing's brother just as he was drawing off the first bottle of 'shine.
"Here, try this and tell me if you think it's aged enough," said the novice moonshiner.
Bob, took a swig, made a sour face, and quickly pronounced,
"Crosby's still's mash is young."