I accidently posted this is exploit section originally and nobody would move it so reposting it in here where i belongs.
Ok not a single thread on this and searched Youtube for it as well and nothing.
In Dalaran at precisely 39.25, 38.75. In Magus Commerce Exchange, to the left of the first aid building. There is lamp on the wall. It looks like a normal light on the side of the wall, but if you move you mouse over it, the little gear to use something comes up.
When you click it the light flickers on and off. Not useful, but a fun little trick.
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