Yikes!

One evening after the kids went to bed I was working in the kitchen on something.  The kids have been playing with our piano more lately, so it was open, but I didn't think much of it.  Then as I'm working in the kitchen I hear a few keys being pressed on the piano and tones coming from it.  I'm the only one home, the kids are asleep, the piano is right around the corner, and I'm getting nervous there is someone in the house!

I bravely went around the corner, and look what I found:

Silly kitty.