A friend came to see the cats the other morning. We've seen this one around the neighborhood. Once, I actually called Dennis after leaving for work to make sure that Mister Bungle hadn't gotten out after seeing this cat.
The neighbor cat was sitting about 4 inches away from our sliding glass door (outside). Dandy was chatting away, and Mister Bungle came into the bedroom to see what was going on. He went crazy and kept pawing at the glass.