Now that I'm warmed up, I'm about to dispatch the big guns. You've got a wine list that tempts. But once your patron has decided on a decent bottle of wine, you pour it into small, cheesy glasses. And you pour the wine all the way to the top. Please don't do that.
Wine is a living creature.
It needs to breathe. In order to develop its full potential, its flavor, it needs room to grow. Ask patrons if they'd like more wine poured. Sometimes it takes a half hour to get that particular glassful open to just the right point. I'm begging restaurants to stop automatically bringing glasses filled with ice cubes and topped with citrus when people order sparkling water.