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Someone who doesn't have a life. If you meet someone like this tell them that they need to be more social.
A person who thinks highly of themselves is often termed as egocentric or narcissistic.
Atheist.
A cosmologist
Ignorant.
zen master
A person who always lies is called a liar.
a white person
Paranoid
If a person thinks they are funny when they are really not, I would call that person a failed comedian, and possibly a fool. Or maybe the person lacks self confidence and that's the only way he know to bring attention to himself.
A thesis statement.
An opinion