United Kingdom, June 15 -- David Letterman thinks sport is a "metaphor for life."

The 78-year-old talk show host is best known for having fronted The Late Show but was able to fulfil a childhood dream in with his ownership of the IndyCar team Rahal Letterman Lanigan Racing, and spoke at length about his passion away from showbiz.

He told CBS Sunday Mornigs: "What I love about it is the romance of it. It's men and women in these machines, 240, 250 miles per hour. They are controlling them with unbelievable precision.

"When you see it occurring right in front of you, it's almost like ballet. You see the movement and it's all a blur. Now, that's underscored by the sound and the sound is unlike something you've ever heard.

"The sound is s...