mine was wen my father died on news year eve the following year hewas knocking on our bedroom door and mum was upstairs at that time she came downstairs and left us upstairs on our own he died in 1964 at the age of 34 but he never left my mams house he done loads of spooky things too many to tell x
I am very sceptical because its never happened to me but I do subscribe to the view that if ghosts can walk through walls then why dont they fall through the floor.
Also why would ghosts need to use the stairs?