it is very easy to 'spook' yourself - to put yourself in a frame of mind that you would jump out of your skin if someone sneezed.
that's why people often say they wish they hadn't watched a scary film late at night - its not so much that they fear the monster will get them - they know it wont - but its the 'spooked' feeling that can give the jitters and a nervous feeling that has to wear off.
that's why feelings of being watched or not being alone, and odd sensations, hearing weird noises etc are really not evidence.
if someone can say, something like, that in broad daylight in the middle of Asda in front of 6 people, a ghost walked towards them, maybe spoke to them then disappeared into thin air - and those 6 other people will back it up, or its even on the store cctv, then i will believe them ...
but its always just tales of weird vibes and "i was asleep, when i was woken up by ..." type stories, that are most likely just dreams, aural hallucinations caused by medication, daydreaming, or reading into things that actually are perfectly explainable.
its not that i don't believe in ghosts exactly, more that i don't believe the people who make the claims - though i do not mean they are all lying.
i think some people genuinely believe they have seen something
all that said - i saw something once - with 3 other witnesses... it was so convincing that we actually tried to speak to it, thinking it was out friend ... our 'friend' then just disappeared ...
another occurrence but one that could partially explain some other sightings is once when i was a kid i was awoken (i know i know!) by my sister sitting up in bed screaming, i quickly sat up ... and she just disappeared ... i stared for a few seconds, presumably think itd been a dream - then she really did sit up and start screaming! (nightmare)
it was like i had foreseen what was about to happen but only moments beforehand.
no idea what that was.
i have never had a premonition before or since