I wish it weren't true, but I have had flight attendants take the opportunity to visit the lavatory in order to re-apply mascara, lipstick, etc. Like passengers, some believe that smooth air, and not the seat belt sign, is an invitation to resume their activities. Although I try to be explicit in my communication to the number one flight attendant, sometimes the message gets lost in translation. My instructions are always to wait for my call. Perhaps some have decided that I have forgotten them. But if that's the case, it only takes one push of the intercom button to confirm my intentions.