Q: How do you tell someone his fly is open or that he has spinach in his teeth? A: When it comes to doling out embarrassing truths, ask yourself: Would I want to be told? Can the situation be remedied ...

You encounter a poor, zipper-challenged person in a public place. Should you say something? And if so, how? Here’s a guide to the delicate art of the open-fly alert, compiled with the help of John ...