University College Cardiff is made up of very old Victorian buildings and is part of what is known as Cardiff Civic Centre (all old Victorian stone built buildings).
After the Second World War there was obviously shortages of materials and skilled labour, so in order to accomodate the expanding University, some temporary buildings were errected in part of the car park. These temporary buildings were known as "The Black Box" and even though they were only made of wood and possible thin metal skins they lasted well into the 1970's.
One day my ex Father inlaw (God rest his soul) who was senior chemistry lecturer at the time was in a meeting in one of the rooms of the "Black Box" when a colleague let out a fair old scream as he put it. Some renovation work was being carried out on the National Museum next door and it seems that a nail from a Hilti gun had missed it's target, traveled across the compound, penetrated the wall of the "Black Box" (wood or thin sheet metal) and not penetrated, but gone through the leg of one of his colleagues..
