Oops...

I forgot to tell you about the picture...
Anonymous got the first part right. Staples. As in, I'm sitting here and there's a stapler. I wonder what it would be like to punch a bunch of staples in the wall and window sill? The second part. An Exacto knife. As in, OH SHIT! I can't just leave a bunch of staples in the wall and window sill because they'll know for sure it was me, so I'll just use this Exacto knife to pry them out and hope that they'll blame it on the dog.
So there's that...

More updates later.