Well, I had two a couple of months ago who were convinced it only took 1 person to "congregate." I was in a window seat in F, and about the time someone (all Y pax) would leave the lav and I'd get the guy next to me to start getting up to let me out, someone else from coach would zip by and get in the lav (it was OK, you see, to have a cue formed at the front of coach for the F lav )

This nonsense went on for 30 mins and the FAs would not let me wait by the door, alone, even after explaining why I needed to wait at the front of the cabin......could not have cared less. Happy to report I haven't seen them since then though, and the regular gals on this route (ORD-FLL) don't seem near as terrified of a middle-aged man waiting to use the lav than these two particular middle-aged men were