Music, history, religion, writing, philosophy, astronomy, quantum physics, theater, coffee, strategy, literature, Altoids, bass, guitar, cello, singing, Monty Python, Brahman, revolution, evolution (if people were intelligently designed food and air wouldn't go in the same place), poetry, movies, songwriting, people-watching, civil war, anything Irish.
Pink Floyd, Black Sabbath, Astor Piazzolla, Arcangelo Corelli, Alice in Chains, Black Label Society, Joe Satriani, Tom Waits, J.S. Bach, Solace, Queens of the Stone Age, Dream Theater, Monster Magnet, Led Zeppelin, Galactic Cowboys, In Flames, Megadeth, Tool, Austin Lounge Lizards, Mudvayne, The Who, The Beatles, System of a Down, Mad Season, Sevendust, Clutch, King's X, Corrosion of Conformity, early music.
Yellow Submarine, Wargames, History of the World Part 1, Donnie Darko, Fear and Loathing in Las Vegas, Hellraiser, The Big Lebowski, American Beauty, The Last Samurai, The Hudsucker Proxy, The Wall, Dazed and Confused, Good Morning Vietnam, The Manchurian Candidate (both versions), Requiem for a Dream, Ghostbusters, The Crow, O Brother Where Art Thou?, The Exorcist, anything by Monty Python, Rushmore, The Omen.
The Simpsons, American Dad, Family Guy, Cowboy Bebop, Star Trek: DS9, King of the Hill, Red Dwarf, Ken Burns, Metalocalypse, Nova, anything on the History and Discovery Channels.
Hitchhiker's Guide to the Galaxy (Douglas Adams), The First Man in Rome (Colleen McCullough), Imajica (Clive Barker), The Jugurthine War/The Conspiracy of Cataline (Sallust), The Hobbit (J.R.R. Tolkien), Personal Memoirs of U.S. Grant, The Screwtape Letters (C.S. Lewis), History of God (Karen Armstrong), The Sandman series (Neil Gaiman), The Decline and Fall of the Roman Empire (Edward Gibbon), Finnegan's Wake (James Joyce), The Killer Angels (Michael Shaara), To the Last Man (Jeff Shaara), Ender's Game (Orson Scott Card), Memnoch the Devil (Anne Rice), Allen Ginsberg, W.H. Auden, and many others.
Bill Hicks, Dave Mustaine, Mr. Rogers.