That's the same look I usually got from the raccoons that took over the garbage dumpster in my condo complex when I lived in Malden. The dumpster had a convenient sliding side door that was made of light plastic, and the raccoons found it trivial to open, which made the side door effectively unusable because there was always a raccoon rooting around in there. The management seemed to think that telling people to close the door in the fence would somehow keep them out. Eventually, the dumpster got replaced with one that had a heavy metal door on the side that took a lot of force to open, and that seemed to work better.