is it normal to fear a tweeting mouse?

I have two cats. My mom bought a mouse to manage their twitter accounts. It is a small white mouse with alarmingly long fingers (about four inches each) that allow it to reach the keyboard to tweet. At first, we were worried that the cats would eat it, but the cats won't even stay in the same room with it. If my mom carries it into a room with the cats, they run out immediately. I don't like to carry it, because whenever I pick it up, it starts tapping its long, bony fingers on my knuckles (click… click… click…), until its eyes roll back in its head. I checked my cats' twitter, and all the tweets are things like "Watching. Waiting.", "Do you dream about me?", and "Don't look in the shadows." I think they're addressed to me. Is it normal to be scared?