It's called gallows humour. It's how we got through the last 20,000 years before people discovered they could be offended simply to draw attention to themselves
If I get up for a job earlier than her, I'll write a small note and hide it somewhere. It'll just say something like how pleased to see me the neighbour's goose was, or how big a shit the dog had in the morning
Yeah that's what I did. A Bluetooth dongle is twenty quid for a decent one, works perfectly with my JBL