Back to nostalgia. When I was at Napier College doing pre-entry journalism we had a couple of class trips. One was to the Strathclyde Police museum in Glasgow's Pitt Street. Most of stuff on display had at some point been evidence at the Sheriff or High Court. Included in the exhibits was the tip of someone's nose. There was also a bicycle chain with metal screws cleverly bound into it with wire to create a pretty fearsome weapon. The metal wire would have held the screws in place even if  the chain had been used to whack a tank. Our guide to the museum was full of helpful hints. Did you know that if you vividly decorate a ski-mask around the eye-holes, many witnesses will be so distracted that they will be unable to say what colour the robber's eyes are? Or what you should squirt in the eyes of victim to temporarily blind them but not risk a serious assault charge by causing permanent injury? I asked the guide what other groups visited the museum. Most of the groups came from local List-D schools, effectively jails for kids. I wondered if she was so free with her handy tips when showing them around. Mind you, even if she was, she probably wasn't telling them anything they hadn't already learned from their mater and pater.