just what is a tripper?

I don't use the word 'tripper' to refer to someone who smokes anymore.
It's hard to define what kind of person I call a tripper,

To me a tripper is someone who is fascinated by things that others aren't. Others may be, to some degree, interested in what they see but not as much as the tripper.
A tripper will stop and watch a ant cross a road.
A tripper is someone who laughs at a joke no one else gets, and keeps laughing even when no one else is.
A tripper can find something interesting, or something funny, in almost any given situation.
A tripper isn't afraid to point out something that they find cool, even if their audience will think its wierd.
A tripper is a kinda guy who laughs at a funeral, can't understand what I mean you soon will.
A tripper would make song references with no point just for the fun of it.
A tripper puts in-jokes into everything he creates.
A tripper would buy a CD because one song has a really kick ass intro.
A tripper would do something to spin someone out, even if the person would have little or no reaction.
A tripper would squash ice cream just to see which way the ice cream would flow.
A tripper takes a joke past the point where it is funny because of what the joke was originally on, to develeping it on for the jokes sake.
A tripper would do a rain dance for the fun of it.