I was at the pool today when a woman started having a conversation on her phone using the speaker.

I politely asked her if she could not use the speaker and pointed to my headphones.
She said, “I don’t have headphones.”
So I said, “You can just hold the phone next to your ear.”

She looked at me with a completely blank expression and said, “I’m on speakerphone.”
I said, “Well… that’s the problem.”

Apparently, we had reached the limits of modern technology.