The priest who normally says the 6:30 on Monday mornings had a replacement priest this morning. Not sure what his name was or what his order is or where he came from, but I have to say it was the first time I sincerely wondered whether or not I was assisting at a valid Mass. When I tell you that the entire Mass was ad-libbed, I am not exaggerating. When that happens, the congregation doesn't know what response to make. The Mass takes on an awkward, lurching, rambling direction that resembles anything but a sacred mystery.
Quite simply, this doesn't happen at the Extraordinary Form, or Traditional Latin Mass. The priest does not make himself the center of attention by leaving the congregation guessing :"Well, what's he going to do or say next?" He says the black and does the red and the focus is rightly on the Holy Sacrifice. It's not impossible to do the same with the Novus Ordo, but there simply isn't the opportunity to "experiment".
BTW, Happy Feast Day to all my Benedictine friends, especially Caroline. There was a time when I entertained becoming an oblate of the Benedictines, but I'm not at all fond of unexpected, uninvited guests, which I imagine is a prerequisite given that hospitality is part of St. Benedict's rule.