My brother and I saw a ghost on our landing every winter. Every time the nights drew in and it was cold we would literally DREAD going upstairs to bed knowing a strange five foot shape would be shimmering on the landing and then disappear as we rounded the corner. Nobody believed us and we were literally petrified.
When I was 20 I went home for a visit forgot all of this and rounded the corner at the top of the stairs only to see the dreaded shape hovering. I marched around that corner and straight into it. It vanished and I gradually became aware that my feet were roasting due to two hot water pipes that run under the floor boards. The heat was rising displacing the cold air and what we saw was the shimmer of heat waves rising. I laughed, but haven’t told my brother to this day. Ha ha he’s now a scientist and still probably BELIEVES that house has a ghost!