This is not an easy question to answer and to make matters worse there is no 1 answer to this question, but I will try to shed some light on the subject.
A typical instance of paranormal phenomenon is in pictures where ghosts, spirits, apparitions and other unexplained things show up in the picture. I am not going to be the one to say none of these are true because there is no possible way for me to know this but there may be some other explanations as to where these unexplained phenomenons come from. Such causes of abnormal pictures are double exposure, smoke or breath in the cold, wild animals eye reflections, sunlight through the window or a photoshop. These are just a few examples of what can distort a picture to show something you didn’t notice during the taking of the picture. This in no way means that the image is not really showing the paranormal but before you believe a picture to be truly showing something paranormal take a minute to really think about the picture and the possibility that it may just be something innocent and not really paranormal phenomenon.
A few other things to consider are a video that is shot at night can hide many different things such as wires, people or even animals manipulating the picture to make you think there is no worldly explanation for what you just saw. It is also really easy to edit videos and pictures using computer software to take out the real cause of what you may believe to be paranormal phenomenon. When it comes to something a little harder to fake like hearing a sound in the house or something along those lines but even these can have simple non paranormal explanation. It could be something as simple as the hot water heater turning on and putting more water pressure in the pipes causing them to rattle which sends an eerie sound through the furnace system. Or something such as a loose pipe in the basement causing a rattling sound when ever someone flushes the toilet or washes their hands.
My final thought is the next time your downstairs in the basement doing laundry or putting a box of old cloths in the storage cellar and you feel that someone is always watching you and making the hair on the back of your neck stand on end don’t jump to the paranormal train of thought to hastily. The explanation for what your feeling may not be paranormal but may have something to do with that fuse box you have lurking somewhere in your basement. Some have said that something with the amount of electricity flowing through it such as a fuse box can create a feeling of not being alone when in actuality your all by yourself and its all in your head.