Getting a strange click sound from the trackpad

Hi!

I was sitting at my desk when I sudden moved over to my bed. I disconnected the the mouse and began to use the pad.

Here's the problem. Everytime I click on the pad-button I get a strange click. It wasn't there earlier today. I get a strange click before the button is pushed all the way down. The "normal" click is coming afterward.

Here's a sound clip of the click: http://trimn.net/mac1/klikk.mp3.
The "big click" is the one I'm talking about, the click after is the normal click sound.

It's a Macbook... Anyone got any solution to this? I tried to take out the battery and blow to se if there was anything stuck under the button.