“What?” asks Jenna, my son’s girlfriend. “I mean, after an interview, when the host says, ‘Thank you,’ the person being interviewed always replies, ‘Thank you,’ and never says, ‘You’re welcome.’ ” ...

Nothing annoys like doing a good deed—say, opening a door or letting someone cut in front of you to keep up with their group—without receiving any acknowledgment. And that’s exactly when it’s most ...