While at a restaurant trying to signal the server that I would like the check, I noticed what I guess was always the case, that some servers walk through the restaurant looking at the floor while others (and I'm happy to say, the majority) scan their tables for signs that, perhaps, someone might want more water or bread or that the diners are ready to order or that someone might simply want to ask a question. Don’t we teach this in nonverbal communication? Don’t we teach this at culinary schools? Perhaps some enterprising graduate student will study eye gaze of servers in a restaurant and the relationship it bears to tips. Then, when it’s clear that eye contact is positively related to the size of the tip, servers will look at their diners, at least occasionally.