In 1991 I met with a security guard at an upmarket travel agents in Henley On Thames, not a High Street one - this was one for millionares. I went to investigate a false alarm,it was approx 11pm, as we walked through plush offices we could hear a door repeatedly slamming, we came to the door - it was an internal door to a small office off a corridor, we were speechless and made a run for the reception area. The guard called his office he could hardly speak, telling them we were leaving the site and trying to explain why. I half filled in my docket on my car bonnet, got a shaky signature and we both left. I returned to the site later that year, the receptionist told me about a guard who recently ran someone down on the driveway to the premises she asked if I knew about the incident, the guard was signed off sick but apparently no one was injured. Freaks me out to this day - I can still see that slamming door.