Really strange mouse action

Over the past few weeks, the wired mouse on my iMac has been behaving strange. Randomly, it will behave as if I pressed the right side button (display all windows that are open). When it does this, I hear the clicking as I would when I actually click the button. It got so bad that I purchased a new mouse. The new mouse is doing the same thing.

Any thoughts?

Try a different mouse mat. My Mighty Mouse acts like it is on high octane if I use a real glossy mat. It has a mind of its own.

I did, still didnt fix it. I ended up going under preferences and disabling the right side button on the mouse. So far so good, the problem has stopped.