The phrase comes from an old story Graham told to explain why investment professionals often act in ways that defy rational analysis. In the tale, an oil prospector arrives at the gates of heaven, only to be told by St. Peter that the compound reserved for oil men is already full. The prospector asks for permission to say just four words to those inside. Granted the chance, he shouts, “Oil discovered in hell.” At once, the entire group of oil men rushes off, leaving heaven’s gates open. When St. Peter offers the prospector a place inside, the prospector hesitates, saying he may as well join the others — after all, there might be some truth to the rumor.