Music, Driving, Driving while listening to music, Physics, Chemistry, Trigonometry, Calculus, Using up oxygen.
Bob Dylan, Pantera, Slayer, Jewel, Megadeth, Metallica (pre-black album), Billy Joel, Pink Floyd, Jimi Hendrix, Grateful Dead, Linkin Park, John Hiatt, Depeche Mode, Disturbed, some Prince, Black Sabbath/Ozzy. I avoid rap, but some is ok.
Lord of the Rings, Star Wars.
None if I can help it.
Stephen King, Clive Cussler, Anne Rice, Greg Bear, Piers Anthony, John Grisholm, Night Gallery collections, Star Trek books (especially those written by Diane Duane). I'll read just about anything, though.