On a recent customer service call, I bid the agent goodbye but did not hang up (deliberately - I wanted to see if they would terminate the call). The rep held the call open for a good 2-3 minutes even though there was nothing from my end except some typing. I’m fairly sure I heard some small sounds from their end so they didn’t just switch to another line.

I’m not usually paranoid - but moments like this remind me to hit the Mute button whenever I’m not directly conversing with an agent. You just never know what they’ll pick up.