One of the gifts of the Holy Spirit!
Kidding on the square, that. Sometimes the intensity of the prayers, the majesty of the service, and the joy of the day come together and bubble over as silliness.
Also, it's FAMILY. The first one, that's likely the home cathedral of that Bishop, he can name most of the people, he knows them on a personal level.
Second one, probably their chaplain. Again, knows them in a personal level, knows their strengths and weaknesses. And sometimes it's a message..."Hey, Buddy! Haven't seen you for a while!"