He called the dot-com bubble in the US leading up to 2000, when the S&P 500 began its 50% decline. He also predicted a bubble in Japanese stocks in the late 1980s that finally popped in 1990.

I try to go to my garage, which I’ve tried to turn into a gym. I thought, “If I’ve got an exercise machine in my garage, I’ll use it all the time.” Will I, though? If I do manage it ...