What's that sound
I just had a minor coronary. I'm sitting here, and all of a sudden I hear something I do not recognise - a very low hissing sound that didn't sound natural, and which kept getting louder and a bit more erratic. It's one of those sounds that panics you for a few moments, until you realise something - that you had put your whistling kettle on to boil so you could make tea. It's like the time I got a bit freaked by this weird beeping noise, only to find out it was the smoke detector telling me the batteries needed replacing.