About 20 years ago, early one cold frosty morning, I got sent to invesigate a chap walking along wearing a balaclava. I asked the control room if they were joking, it was minus 8 or something and balaclavas ate actually for keeping people heads warm, and considering the bitter weather and the fact he was doung nothing more dodgy than walking along he was probably just trying to keep warm.
The control room inspector told me he was not joking, and I should go and investigate the matter. It seems the simply act of wearing warming headgear on a freezing cold day, with no sign of a shotgun or crowbar, was suspicious.
So i went to the area, found the chap walking along, and - feeling like a bit of a berk - asked him why he was wearing a balaclava. "Because its -8 and I'm trying to keep warm". I took great delight in telling the FCR "I told you so".
For an encore I was half expecting to be sent to a sighting of a suspect with a carving knife in a kitchen, or a motorcyclist wearing a helmet, but the call never came.