>> with a family history of heart disease and a lifetime of bad eating habits, president clinton told me he was a heart attack waiting to happen. but what does someone really look like who is about to have heart attack? you probably wouldn't think this guy. tom bare, 53, thin, seemingly healthy, and one step short of a full-blown heart attack. in fact, he's checking into this hospital in lincoln, nebraska for open heart surgery. it's an important lesson. what you see on the outside doesn't always match the inside. >> obviously closed down quite a bit. >> the surgeon shows us the striking images on the angiogram of bare's heart. >> you can see this tight narrowing right there where that