Weird remote behaviour

[dougakers]

Normally we stream Spotify from our iPads using a nose speaker. Works great, love it. Occasionally we will also play it at work on our MacBooks using headphones.

This morning I was at home doing some yard work and listening as normal. My wife was at work and even though Spotify wasn't running on her laptop she could hear what I was playing at home -- intermittent but definitely the same stream as I quotes some lyrics to her.

How does that happen? Her office is 15km away from home.