IBM ThinkPad noises

So I'm sitting here at home using my ThinkPad T43 and just noticed a strange buzzing noise coming from nearby. It happens whenever the screen scrolls, like when scrolling on a webpage.

I've tracked it down to the AC adapter brick. It buzzes whenever I press a key or use the touch pad. I just touched it and it's very very hot.

Normal behavior? Or am I risking a fire by using this in my house?