Seeing ghosts

When someone asked me how to "see" a ghost, I had to think about it.
You either see it or you don't.
It is either there or it isn't.

But that doesn't help.
Remember, ghosts need to borrow your energy in order to materialize.
Unless they save up energy somehow, if it doesn't dissipate or can be stored in ghostly batteries, they aren't good for more than a few seconds where you can actually see them.

The signs that there might be a ghost nearby...or a spirit wanting to take your energy...are unusual cold spots in a room and if you are sensitive, the raising of gooseflesh on your arms or neck. (This can be because of the cold or because of the energy transfer.)

Actually, there are electromagnetics involved and EMF meters can and will measure the electromagnetic fields. Drop in temperature, a draft in a room without windows or outside openings will also indicate a spirit trying to manifest itself. You don't lose anything much, just a bit of energy and you really have plenty more than a spirit can take. They seem to be limited, however, in what they can siphon from a living being. They certainly cannot drain someone's energy completely. Maybe in Hollywood, not real life. Or death, as it may be.
Infrared cameras can also detect heat differences in a room, which will sometimes outline a form of a spirit in blues and light greens that can't be seen with the naked eye.

Now, as for seeing a spirit, that's tricky. Providing one is in the right place at the right time, and sensitive enough to feel the presence of a ghostly being, it will happen. For those individuals who are not "sensitive" or are so anxious to find a ghost they give off strong, negative energies, it won't happen. The negative vibes will chase the spirit away. Fear won't, but anger and depression will.