You can learn a lot about who loves you by walking around with food on your face.

Should you tell someone when they have food on their face?  You will embarrass them but you will spare them embarrassment later.  The embarrassment comes from common knowledge. He knows that you know, etc. that he had food on his face.  You would escape this if you could alert him about the food without him knowing it was you.

You could wait and expect that the food will fall.  But you run the risk that it won’t and he’ll discover the food and realize that you let him walk around with food on his face.  And once you wait for a bit you are committed.  You can’t very well tell him after the meal is over.  “You mean you sat there talking to me the whole time with sauce on my chin?”

And what happens when you are in a group and one guy has food on his face?  Whose going to tell?  Whoever is the first to talk proves that everyone else was willing to ignore it.

Bottom line:  if you are dining with me and I have food on my face, send me a text message.