F...People that take the middle urinal

[firstdown]

When I built my office I put in a nice bathroom (like a large home's half bath) in the back of the office and had the walls insulated but the door is hollow and has about 1/2 inch gap by the floor. Also in the back is office supplies, fax/copier, and file cabnets. I have a small office with 3 other ladies that work here. Every time I go back to drop one it seems like they all need something from the back room just off the bath room. I mean I get in there and I hear someone at the files, someone sending a fax, and someone back there doing god knows what. Its like they are doing nothing and the minute I slide in there they are having a party just outside the door. When my wife worked here I ask her WTF was up with everyone in the back room when I'm in the bathroom so I got her to stop. Not sure how to ask an employee to stop.