OMG, Angela - you're right - when it gets too quiet in the house we know he's up to something!!
You also reminded me of one of our funnier incidents. Coop seemed to be chewing on something and I ignored it at first - figured it was a rawhide or something but then he was just sitting there acting all weird about his chewing. When I took a closer look, I found a piece of gum in his mouth! He couldn't figure out how to swallow it.
Originally I had spit it into a wrapper and put it in the trash - now we have a special trash for food stuffs, including gum!