A leg of salmon is usually used as a joke in the work place and is generally used to test the gullibility of a new employee. It starts off by the manager or someone of senior authority asking the unsuspecting employee to carry out a personal favour for them. In this case the boss has asked the new employee if he/she minds going to the fish mongers to collect the leg of salmon that the boss had ordered earlier. Wanting to impress his/hers new boss the new employee (not giving a second thought of what he/she has been asked to do) willingly obliges to go on the errand only to be told by the fishmonger (in the tone of 1+1=2) that salmon don't have legs and return back to their place of work (usually to be greeted by hysterical laughter) looking as pink as a salmon.
Boss: "Jimmy"
Jimmy: "Yes Sir."
Boss: "Could I ask a favour?"
Jimmy: "Certainly Sir."
Boss: "The CEO has called a meeting this afternoon and I have ordered a leg of salmon from the fishmongers over the road, please could you collect it for me, as I wont have time after the meeting. All you have to say is "I have come to collect the leg of salmon reserved for Mr Smith".
Jimmy: "Oh yes Sir. I'll do it straight away Sir."
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