Yeah, that's cool. It is the kind of behavior you can mess with if you want. You have to be careful though that the rat is the the warmest thing in the vicinity or they can get confused and worst case go for your face. I think it is funny when they get that excited but I am pretty nimble for an old dude. My wife has gotten tagged a couple of times on her hands though because she doesn't always do the mental reset that even the most docile ball can get really excited when they smell rat.