The operation of the television, as all electronics, involves electric currents.
If your TV uses a CRT display as it operates it happens to build a large static electric field on its face, as a side effect of that operation.
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A charge in motion is usually called an electric current, but could also be called dynamic electricity (analogous to a charge at rest being called static electricity).
Lightning is static electricity. It's a buildup of charge, and it is facilitated by charge separation. In that light, it is DC.
Which materials make more static electricity when different objects are rubbed up against eachother.
Because this points to the current object, but static methods don't have a current object (actually this is definition of the static methods).
There must have been a build up of static electricity, either in yourself or in the trolley. The shock is the spark as it makes its way to earth.