A keen collector of old bibles meets a friend, who tells him he has just thrown away an old copy of that very book.

"It was some kind of Gutton ... Guten ..." he says.

"Not an old Gutenberg, by any chance?" says the bible collector, horrified. "A bible like that would fetch 3 or 4 million at an auction!"

"Well that's OK then," says the friend of the bible collector. "This one was probably worthless. Some idiot called Martin Luther had scribbled comments all over the damn margins."