1. Personality Cafe and the massive train wrecks on it.
2. George Carlin
3. Probably you
4. People, especially dumb/stupid people with shit for brains
6. The movie Ghostworld, Office Space, 10 Things I Hate About You and other movie scenes, that I cannot remember, etc
I am easily amused by a lot of things I observe, then my brain takes those observations and puts it through the smart ass/sarcastic/mock cycle and spins out some great shit. As a result, I have a permanent grin on my face for a good while, it's fucking awesome and I probably look pretty retarded when people wonder wtf I'm laughing at. I'm sure there's definitely some Ni going on there as well: Observe A, Jump to F, Conclusion: Major lulz to death.