I reckon so but mostly because it upsets me slightly to think that all there is to existence is 70-90 years of oxygen recycling.
NSC knows all.
Do ghosts exist?
Other things that don't exist:
Time travel
Reincarnation
Clairvoyance
God
I think it's just an impression left in the ether as it were so not real but just a sort of mist left hanging. My neighbour was driving in the Lake District once and had to slow for a regiment of Roman soldiers on the road which he assumed was one of those re-enactments. After carefully passing them he checked the rear view mirror and there was nothing at all there. He is a pretty genuine bloke so I do believe him, however, he is a Watford supporter so you never know!
Doctor Who, Game of Thrones. It's all made up shit written and acted by people who are paid to do it.
Made up stuff does 'exist' though - as fiction. The things you list are real TV programmes. Time travel, reincarnation, clairvoyance and god are all made up so they also exist as fiction. I think the OP is asking whether ghosts exist as real things. Obviously they exist as fiction. Especially in A Christmas Carol. And Ghostbusters.
An interesting question is "does something exist simply because we believe it exists"? When I was a lad I knew people who thought that Coronation Street was what we would call today 'reality TV'. We are all free to believe anything, but this has no relationship to whether the belief is correct or real. I think the OP is asking whether ghosts actually exist, not whether we believe they exist. However he may not have thought his question through.
Why aren't there ghost of seagulls or prawns, why should only humans be afflicted with spirits, souls and stuff.