I prepared myself mentally to go out to the local shop to get some things for lunch. Then just as I was about to leave I heard the building's cleaner, vacuuming the corridors. I knew they were close to my door so I didn't want to leave while they were nearby. I waited for about 5 minutes and they were still cleaning, so in the end I just had to go. They were about 5m from my door. I looked at her a couple of times and smiled as I didn't want her to think that I was ignoring her. She didn't look at me though.