Dear Amy: What words of advice would you have for addressing someone who is in a public place having a very public, loud and personal phone conversation on their Bluetooth earbuds (or cellphones in general)?

I'm completely baffled as to why someone does this, but I see it all the time — in grocery stores, business offices, you name it.

No one wants to hear it, and it makes me feel awkward and uncomfortable.

Amy says: I believe the reason people tend to yell into their cellphones while they are using earphones or earbuds is because they can't hear themselves very well because their ears are plugged by their earbuds.

People tend to quickly believe that they are isolated when engaged in a private cellphone conversation, even in a public space. Landlines (remember those?) have microphones in the earpiece so speakers can hear themselves. Cellphones don't seem to utilize this function as well.

The so-called "Lombard effect" describes the human tendency to raise our voice to match the noise around us, even when this is unnecessary.

Yes — this is annoying! I'd like to augment this gripe by adding an additional annoyance: People who use FaceTime in public.

I understand that all grandparents find their grandchildren adorable and compelling, but must they visit with these children over FaceTime at a crowded restaurant? And again with the yelling!

Only one time have I actually confronted someone doing this. I approached a man who had shared some extremely sensitive and proprietary information over the phone while sitting right next to me at a Starbucks. I told him that I couldn't help but overhear everything he said and that he should be much more careful about publicly sharing private details. (Did this caution work, long term? I doubt it.)

I am deliberately dodging your actual question, because — other than trying to make eye contact and putting your finger to your lips in the universal "shhhhh" gesture — I don't know how to respond to these loud intrusions.

Readers will want to weigh in ... using your indoor voices, please!

Moocher warning

Dear Amy: My friends and I are having a nice dinner at a casual restaurant when the table next to us vacates and leaves behind a bottle of wine that is half full. Shall we grab it and celebrate, or leave it to the restaurant?

What a dilemma!

Amy says: If swiping wine from a neighboring table after the diners have finished their meal is your idea of a true dilemma (implying a decision between two relatively equal choices), then I will guard my French fries with more than the usual ferocity the next time I dine near you.

These other diners have paid for this wine — just as they paid for their steak or crab cake — and it is not appropriate for you to decide what to do with their leftovers.

For a more professional assessment of your question, I've shared it with Meaghan Frank, vice president of her family-owned winery. Meaghan also is an instructor for the Wine and Spirit Education Trust.

Her response: "There are several issues here, hygiene being one. Just as you would not help yourself to water from another table's half-finished pitcher, this bottle will have touched glasses which others have drunk from.

"Taking this wine is also not fair to the restaurant and staff. If your group decided to drink it at your table, you would be taking up the table for a longer period, preventing the restaurant from turning the table over, and likely affecting the amount of the server's income for the night."

Send questions to Amy Dickinson at askamy@amydickinson.com.