A rare book collector ran into an old friend who told him he had just thrown away an old Bible that he found in an old box in his attic. He happened to mention that Guten-somebody-or-other had printed it.

“Not Gutenberg?” gasped the collector.

“Yes, that was it!”

“You idiot! You’ve thrown away one of the first books ever printed. A copy recently sold at auction for half a million dollars!”

“Oh, I don’t think this book would have been worth anything close to that much,” replied the man. “It was scribbled all over in the margins by some guy named Martin Luther.”