One from dad in law.
He was a WOP in Lancasters toward the end of WW2. Two Lancs did not return from a sortie, and one of the crew (lets call him Bill) from one of the missing Lancs had a bed in dads dormitory. That night, after they had all got to sleep, dad was woken by the smell of cigar smoke. He could see a figure dressed in full kit sat on Bills bed, but couldnt make out who it was. He could however, see the figure was smoking. Dad sat up, and as he tried harder to make out who the figure was, the figure stood up, stubbed out his cigar, walked over to him and ruffled dads hair. He then walked toward the dorm door, and dad instinctively said 'you alright Bill ?'. The figure turned and said 'I'm fine Sam. Tell Tiggy I'm sorry' and walked out the door.
Bill of course, had gone down with his Lanc that night. He had smoked cigars and had the habit of ruffling dads hair (dad is short and Bill was well over six feet). Dad at first thought he had dreamt it all, no one else in the dorm had seen or heard anything, but a short time later dad found out for the first time that Tiggy was the nickname Bill gave his wife.