He was alone in his first floor office after normal hours. He went to collect some documents from the printer. To do so, you have to walk past a large window. As he did so, he saw his own reflection and that of somebody standing behind him.
He quickly turned to see who it was but it, a 'shadowy form' disappeared down the front stairs. The MD followed it down in the reception area and searched the first floor offices. He found nothing and nobody.
Following this tale getting out, one of our sales engineers admitted to feeling an overwhelming sense of being watched by somebody close, behind him. He too was working alone one night in the first floor office. He was so shaken, he left and locked up without going to gents despite him being desperate for a pee.
When he got home his wife, who is some kind of spiritualist detected his unease. She "examined" him and said he'd been visited by the spirit of a caretaker who had died in the factory's boiler room.
Woooooooooooooooh. Has anybody else had similar experiences.