Also, to clarify most of that content:
Most of the pictures either are grainy, which causes certain pattern to apear, the human mind is set so it can recognise objects out of patterns, which would believe to ghosts. Same thing with reflections, seen in some photo's. As with the security guard's video, this could be because imput lag or a certain object blocking the light at that location, for example a bird infront of the light. The last one with the television screen is an infinite loop, which causes patterns to apear, exacely the same as i earlier said.
Its all in people's minds.