So specific ah??

We were running through some British Standards for a code of practice we were reviewing. I was almost half asleep, when this one member passed a page of the BS code over. On one of the items of potential hazards, the code listed,

"booby traps" such as used syringes taped under banisters, on top of kitchen units and doors, etc. maliciously left to injure site personnel.

which got us wondering what actually happened over there.