The worst (or perhaps most inexperienced) waiters seem to lack those powers of observation or ability to match the ebb and flow of conversation at a table, which leads to them hovering or interrupting at just the wrong moment. As a result, here are a few tips for servers when they might want to give a table a minute.
If all eyes are on one diner, said diner is likely in the middle of a particularly compelling or funny story and should be allowed to finish.
If two diners appear to be on a date and both of them are looking at the tables around them silently, interrupt often and at your pleasure. Maybe even bring them a free drink.
If wineglasses are empty, feel free to ask if someone would like their glass refilled. Otherwise, we've got it covered, as author Christopher Hitchens explained in a scathing essay back in 2008.
If I make eye contact, I need you. Like in basketball, please keep your head up as you walk the floor, so that I have the opportunity to catch your eye.
What other advice would you give to servers with regard to approaching your table?