Yes I saw one

I do kind of... I never at first, but one time I was laying in bed in the morning after waking up. I was facing my wall and my door was closed and I heard a kid's laugh in my ear, I froze and thought it was my brother and somehow he managed to get into the room quietly, so I turned around slowly (like in the movies) and no one was there.

Second time, I was at my grandparents and it was about 3-4am, I was sleeping in the living room but I was watching TV and they have cats so they come in and out of the door but I always close it, one time they came in and as I leaned over to close the door I saw a shadow in the dark and I jumped back and at first I thought it was a family member until I called and no one responded, so as I realized, I jumped back frozen to the couch waiting for them to come in but they never did... I didn't sleep that night.

Thirdly, once again at my grandparents but this time I was at the table and my grandma was closing the curtains next to me, however I saw a figure walk past the door, I went into the kitchen to check but no one was there and the others were asleep.

Lastly, I was running myself a bath and as I was checking the water, I leaned down and you know when you sense someone is coming up behind you to try scare you? Well I felt this and I thought it was my brother and I felt them walking towards me from behind and I waited until it felt really close and as soon as I turned no one was there and I crapped myself.

Ive never actually seen any but I have heard and sensed and actually acknowledged their existences experiencing weird orrurences. Yes I do believe that ghosts exist.

i believed i saw one when i was little , but it goes against the fundamental laws of physics so im conflicted

Yes.
My father who is a huge skeptic told me this story and I completely believe him:
My dad's mother died when he was about 14 years old and for about two weeks after her death him and his brother would hear footsteps in the attic of the apartment building they lived in (they were the last apartment before the attic). Now let me explain something to you: The building they lived in is an old, pre WW2 building that had no electricity in the attic so people would only go there during the day. It would be absolutely pitch black at night. Also, my father's family was the only family with the key to the attic, other neighbors would have to ask them for a key first if they wanted to go up there. My dad is 100% he heard footsteps because he lived there for years and knew what it sounded like when people were up there. He told me that him and his brother would always try to go to bed early because it terrified them so much and it started at about midnight and went on until 1. Now he told me he regrets not going up there and checking it out. He thinks it was sort of a 'goodbye' from their mother. It stopped after about two weeks.

Yes.

No

but i believe ghosts belong in a paranormal plane, which i believe is beyond the scope of physics

i don't know if i'll believe since i haven't seen or felt one. The only thing that gives me creeps is my wild imagination

Yes

I saw one when I was 7 and will never forget it.

I woke up around 3 am and saw a woman hanging from her neck from my window. She had cuts all over her body and was grey. I could not scream nor react. I just kept staring. I managed to get my hand to my sisters leg cuz we all watched a scary movie so she slept in me and my brothers room. I cut her really deep and suddenly was put into a trance until I fell asleep. I woke up and she was bleeding from her leg and I kept shaking and telling everybody what I saw and they all just brushed me off cuz I was only 7... I will never forget the image.

you could have seen a real thing and probably the murderer took it off when he noticed somebody saw it