As a former employee of Sheffield City Council, I'm reminded of two memos displayed on the staffroom noticeboard in our school. They were both issued on the same date and both signed by the Chief Education Officer:
Memo 1 (from the person responsible for fuel economy): "In order to save on heating costs, where any room in a school is fitted with curtains they must be drawn closed every night"
Memo 2 (from the person responsible for fire safety): "In order that any outbreak of fire can be identified as quickly as possible, where any room in a school is fitted with curtains they must be left open every night"
:-)