From a reader:
Is it licit for a priest to say “Have a nice day” after the final blessing?
When the Mass is over, priests and bishops can utter any banal cliché that pops into their distracted heads and not technically violate the rubrics.
Violating custom and good taste is another thing.
But we must ask: When does Mass end?
I checked quickly in the Novus Ordo’s General Instruction of the Roman Missal in the Concluding Rites to see whether or not the exit procession, recessional, is described or prescribed. The relevant bits I found were:
D) The Concluding Rites
90. To the Concluding Rites belong the following: [...]
d) the kissing of the altar by the Priest and the Deacon, followed by a profound bow to the altar by the Priest, the Deacon, and the other ministers.
That sounds like Mass ends the moment the celebrant kisses the altar. But also:
186. Then, together with the priest, the deacon venerates the altar with a kiss, makes a profound bow, and departs in a manner similar to the procession beforehand.
It seems that, in the Novus Ordo, the exit procession, recessional, is part of the rites of the Mass.
When the exit procession concludes (there should be a moment that defines the conclusion, as there always was in the sacristy when everyone would bow to the Cross and the priest would bless the servers) then the priest can violate good taste all he wants.
Therefore, priests should eschew rubric-violating outbursts of logorrhea at the altar. Decorum and custom require a dignified exit by the sacred ministers (hopefully with a minimum of grinning, waving, winking, and hand pumping), and a respectful silent waiting on the part of the laity until said clerics have once again drawn themselves apart (please, God, to the sacristy).
Let the rag chewing and back slapping occur amid the coffee and doughnuts in the church hall.
Have an adequate day and try not to sin.