I haven't experienced synchronicity much at all, but I do remember one time I was at work during the graveyard shift. Out of boredom, I started singing some song, forgot which it was. Then I was like, "fuck it's quiet, I'll turn the radio on." So while still singing said song, I turned on the radio. Not only was that song playing on the radio, IT WAS AT THE SAME VERSE!!!!
I've never seen a ghost cat to my knowledge, or at least not definitively. However, I think maybe ghost kitties haunt my parents' house, or used to. A few nights after my first cat died, I was lying in bed with my other cat. Now, the first cat always slept at my feet, while my other cat slept by my head. That's how it always was (that second cat was always very affectionate and liked being near people's heads). Well on that one night, and only on that night, my cat was sleeping at my feet rather than by my head. I asked her, by her name, if she missed "her", of course "her" meaning the dead cat. No response. She was just a cat, so of course she wouldn't understand, right? Then I told her, again by name, that I loved her. No response. Okay, that's fine. I waited a few seconds and a thought occurred to me. I called my cat by name a couple times. No response. Usually my cats will meow in reply to me calling their name. Then I said the name of my first cat. "Meow." ... I then said I, "I miss you, Ness." "Meow." That was too creepy, so I had to be sure... "I love you, Koki." Silence. That was the only time my second cat ever slept at my feet. Even our third cat would never sleep at my feet. Even when I changed beds and moved to a different room, none of my cats would sleep at my feet. My current one does now, but for five years she either slept on my belly, thighs or shoulder, never at my legs.
Many years passed. The second cat was apparently growing senile with age and would howl randomly in the middle of the night either at the top of the stairs. I'd get out of bed and call her over, but she'd keep howling. When I would get within view of her, she'd give a cute little meow like, "Hey, what's up?" then come back to bed with me. Eventually our third cat died, but I had since moved out of the house, so I don't know if the howling increased after that. I know she still did howl nearly every other night. If it was senility, I don't know why she would always go senile in the same spot.
Eventually she too died. I went to my parents' house to do laundry and say goodbye, because my mom said she wasn't doing well in her old age. I discovered her corpse in an ice chest and ran out of the house with my clothes still soaked. A couple weeks later I went back to the house to grab my Magic: The Gathering cards and some other stuff from my old room. No one was home at the time. I said hi to my parents' new cats and fed the dog and fish. While rummaging through the stuff in my room, I suddenly felt slightly nauseous, my heart started palpitating heavily, I had trouble breathing and started sweating. For whatever reason I became absolutely terrified of my room, raced out of there and up the stairs to the dining room. As soon as I got to the top of the stairs, the feeling of fear subsided and I could breathe easily again, although my heart was still racing and I was shaking all over. I hastily grabbed my stuff and ran out of the house and didn't go back there alone for quite some time. I don't know what made me so uneasy. The circuit breaker was in the basement too, but it was nowhere near my room and I had no problems with being in the rec room or laundry room or even the downstairs bathroom (anyone that's watched Ghost Hunters should know what I'm talking about). I think there was one outlet in that wall I was near. In the two or three years I'd stayed in that room, I never had problems with it. But that one day I was morbidly terrified of my former bedroom.
That wasn't the first time I thought my parents' house was haunted. I always thought there was a ghost in the basement, so I'd turn the lights on before going downstairs. My mind would play tricks on me and I'd see white apparitions at the foot of the stairs. Yeah, the same basement I ended up living in for a few years. But sometimes at night I would near noises in the kitchen. I would hear cupboards being opened and shut. I thought maybe it was my parents, so I got out of bed and peered into their bedroom. Both my parents were in bed. I'd cautiously walk downstairs to the kitchen. All the lights in the house were off. When I got to the kitchen, I turned on the light but there was nobody there. I checked a couple more times and then eventually decided it would be best to leave Slimer alone (after I saw Ghostbusters, that was the explanation I gave myself for the noises I was hearing). Now at my parents' house in the same room I slept as a little kid, I hear scratching noises, but that could be squirrels or birds. (It's still creepy, though).
Of course it's possible I just dreamed up the sounds. I know for a fact I'm a sleepwalker. They say sleepwalkers don't know they do it, but I've found myself literally walking around a bedroom, dorm room, whole condo, or even an entire house either unaware of where I am, thinking I'm in a completely different building with interactive objects (those were some of the trippiest walks), unable to see anyone else even when I know they're right in front of me, or seeing Muppets instead of people. ... I was very young. Woke up one night and looked in my parents' room. I didn't see them. I figured they were in the hot tub. So I walked downstairs, to the kitchen, and opened the back door. I looked outside (I remember the cold of the night on the screen door) but the hot tub was covered up and no one was out there. So I closed the door and locked it back up. I didn't check the basement (it was too scary), but thought maybe I just didn't see my parents the first time. They must be in their bed. So I walked back upstairs and this time actually went into my parents' room. I walked up to my dad's side and looked down at the bed. To my surprise, I saw Animal where my dad should have been and Miss Piggy where my mom should have been (she's not fat, so I dunno why it was Miss Piggy). I think I just turned around and went back to bed after that. You're laughing now, but that shit is traumatic to a little kid!
I do believe in guardian angels. That's the least selfish way to put it. The alternative is God loves me and doesn't want anything too bad to happen to me. I just know there's been so much shit in my life that could have either maimed me or killed me and I've walked away without even so much as a scratch. I don't believe in luck because I can't win shit, so I believe someone or something is protecting me. ... And I ain't gonna intentionally test that theory; I'll just say, "if you're out there, thank you," and try to live my life in relative safety.