It's fairly well known that Warren Buffet still lives in the house he bought in the fifties before he got ultra wealthy, but I was watching a documentary a couple of weeks back where he was explaining that his choice of breakfast at the McDonald's drive-thru window is dictated by the market closing price the day before. That's hardcore... and a little eccentric probably.
Found it:
http://www.hbo.com/documentaries/becoming-warren-buffett