What is the worst thing you know about someone? And can't do a thing about it? Some years ago, I had an acquaintance who was very briefly an officer in the Gunners. He left, due to having technical proficiency and discipline nay responsibility issues. He was also an out and out racist. Ironically he went on to work in Africa... One night while everyone was drunk, he told a story of his trip round Europe as a student. Drunk in Copenhagen (three words which anyone familiar with the city will agree go together well) he was strolling along the dock side looking for somewhere to sleep rough. He saw a bloke, equally drunk, staggering the other way who snarled at him in Asian tongue. Affronted "X" then pushed the chap and he promptly went into the dock. Sank. Never surfaced. The next morning I had one of those, "what the f*** are you supposed to do?" moments but rationally there wasn't much I could do, as I wasn't a Danish CID officer and all "X" had to do was deny it. Yet to this day I know "X" killed the chap - or rather facilitated the icy water of Copenhagen's harbour in killing him. Does anybody else have a similar "burden" on their conscience where they know who left the tap on, the engine running, the DNA samples in the microwave?