Bill O'Reilly interviews author of "90 Minutes in Heaven"

Don Piper, a man who was pronounced clinically dead after a car crash back in 1989, was interviewed this week on "The O'Reilly Factor." Piper wrote a best-selling book, "90 Minutes in Heaven," about his experience. But it wasn't his time yet:

PIPER: All I remember is being at the gates and about to enter after a lot of other magnificent things that I saw and heard. As it turns out, 90 minutes after the truck hit me, a man climbed into the car and, because he felt like God spoke to him, started praying over me, even though he knew I was dead.

Suddenly, I found myself back in the car under the tarp in the dark. He's singing a hymn, and he's making me sing it with him. And I had no idea what had happened to me.

Piper added that heaven was such a magnificent experience that he can't wait to go back.