People are likely to become ghosts after their death when

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They have many unfulfilled desires.
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Many personality defects, such as anger, fear, greed, etc.
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A lot of negative impressions in the mind.
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A high amount of ego.
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They have harmed others and have the basic nature of harming others.
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They do not exist in the positive planes of the universe i.e. Heaven and above.
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They have unfulfilled desires such as cravings for sex, alcohol (things that they can only experience through a physical body), revenge etc.
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They derive pleasure out of exerting control over and tormenting humans and other subtle bodies. Their general aim is aligned with bringing about unrighteousness in society.

The subtle body of a person after physical death is defined as a ghost if their characteristics and intentions match the above. There is no special process as such which they go through to become a ghost.

casper

Yo. My house is haunted, no joke. My parents and my brother are the only people actually affected by it. Whatever "it" is in this house knows better then to even attempt to mess with me.

..well thats just great as if i dont have enough problems with getting a date now ive got to worry about some damn dirty ghost trying to hook up with my pu nay nay and drink up all my good liquor
..will it ever end
..but i suppose there is a light at the end of this tunnel per se..pun intended ..i could become a ghost and do it to the next guy...i guess i could use the pick up line..girls do you know what its like to be filled with the spirit...

I think you left out one. Some ghosts, from what I've heard and if you want to believe it, just don't know they are dead.

I remember hearing a tale of a ghost that brought an armfull of (etheral) wood to a house every night. It seemed he was a ghost of someone who died in the early 1800's. He had been chopping wood hit his leg with the axe, and bled out before anyone could find him. That was the story. Thought I'd add that to the discussion.

if you were nice they would share the reefer with you!!!

yeah some don't know they are dead.those are the ones that will interact with you (touching,talking,moving things...)in attempt to get your attention

Those qualifications regard probably over 90 percent of society. You're not saying 9 in 10 people are destined to become Casper?

Ghosts aren't real.

Yeah right, next you'll be telling me there's no Santa, Leprechauns or Fairies. Look man sell crazy elsewhere, I'm full up here.

<---its going to be scary waking up at night and seeing him with that face right in front of me

Okay, so who is it that levitates things and turns on the stove burners in my apartment?