Also for the record of any passengers, just because the've spent the last hour and a half in the terminal at the bar and then don't have time to use the loo before boarding doesn't mean that they can ignore the seatbelt sign and go immediately after take off. They may be dying for the loo but they'll be dying of something else if the aircraft hits turbulence during the climb.
This kind of situation happens all the time: crew where in the galley after take off and a/c still had seatbelt sign on. Pax appears in galley wanting to use the toilet. Crew spend nearly as much time arguing with them about it and trying to get them back in their seats as let them use the toilet.
... and another thing why do pax always "simply have to go now" about 2 seconds after the seatbelt signs are put on for landing 4 hour flight and they all need to go in the last ten minutes...
Tirade over.
