Warren Buffett, America's most successful investor and one of the world's wealthiest people, auctioned off his 2006 Cadillac in February for charity. It was sold to a New Yorker for $122,500.

That's $110,500 more than it would have been worth if the Oracle of Omaha himself hadn't owned it and signed the dashboard in black marker. Proceeds from the sale went to Girls Incorporated of Omaha.

The DTS Cadillac sold for considerably more than the last car Buffett auctioned off for charity, a Lincoln Town Car that went for $70,000 in 2006.