Reply #4: Get an optical mouse and then the peanut butter won't mess up that little ball thingie.

[jobycom]

If you mean the furry kind, I'm the wrong person to ask. The last time I found a mouse, I made friends and named it. Cute little guy. He even got to where he'd come out at night and watch me work, though if I got too close he'd scurry back a little. He used to steal my pistachios, and one day when my printer jammed I found that he had been storing them in the paper tray. This was at my office at work--my cats aren't as friendly as I am to the little critters.