Haha, yeah, it's funny with ghosts. I do believe in them and I watch some spooky shows with people going to haunted places looking for ghosts. All it takes for most of them is the tiniest *swoosh* and they're all
oMg iT's A gHoSt! 
Meanwhile I'm watching with good headphones on, being like "that was literally just wind, my dudes

". They use some ghost hunting equipment but I don't know how that stuff works, so I take their results with a grain of salt.
For some things I can't find an explanation, but I don't assume it must be a ghost. I usually think it's probably a very easy thing to explain, I just don't know enough science and what not.
I sometimes see shadows in the corner of my eye, at various times of the day. I don't immediately think it's something paranormal, but when it gets very frequent during one period of time (or even one day) and it's beginning to make me feel uneasy, I'll sage the apartment or even just pray. That always helped so far (fingers crossed I won't get some hard-to-get-rid-of demon infestation now, lol). Whether it's paranormal or my mind playing tricks on me, if something makes me feel better, why not do it?
Several times I've been home alone, feeling weird and seeing things and a thought came to my mind that maybe there's something messing with me. So then I just caustiously say out loud "hey, you're making me uncomfortable, please stop or go away, if you're here to play mean you're not welcome". Or anything along those lines.
Lately I burned an incense and in my side vision I saw a black cat run by, but I knew 100% it was just the smoke flowing over something black in the background. Still made me think that my Cat Spirit Guide came to visit so I thanked them in my thoughts. Maybe it's silly, but at least it makes me smile and have a nicer day ahead.
That said, I don't really have experience with ghosts. My dad does and it's quite hard not to believe his stories. Unless you want to call him a liar, that is
