I guess I dreamed it. It wasn't Katie Couric because I was an adult when that happened. I remember being a kid at home and seeing the video of what looked like a tunnel but it was video of someone's colonoscopy.

What I did find was that Reagan had polyps removed and they basically showed a diagram of a person's digestive tract on the nightly news and Reagan's handlers were embarrassed by that. Maybe one station also showed the video through a random person's butt tunnel to go along with it or something.