In the summer of 1990, I worked as a room service waiter at the Albany, NY Marriott.
One day I brought a breakfast tray up to a room, and to my surprise Captain Kangaroo answered the door. He was older and grayer, but I was fairly sure it was him. Unfortunately, he wasn't wearing the red blazer with the wide lapels so I wasn't 100% sure. As the man signed for his breakfast, I asked him, "Excuse me, but aren't you Captain Kangaroo?"
He looked up and said, "He's a good friend of mine." I replied, "Tell your friend that I loved his show."
He smiled and thanked me.
I still have the signed room service slip. :-)