Reading, Talking, Being a Sophist, Squaring Circles, Trisecting angles, Doubling Cubes and anything else that troubled ancient geometers.
Bach, Beethoven, Chopin, Stevie Wonder, Bob Dylan, The Cure, P-Funk, Beth Gibbons, The Moldy Peaches...
Ya know, normal stuff, The Big Lebowski, Star Wars, Terminator, Charlie Kaufman Movies, Hayao Miyazaki movies, the list goes on.
Star Trek (all of them), Lost, Alias, Entourage...
Anything written over 300 years ago, except Thomas Aquinas. Henry Miller, T.S. Eliot, Whitman, Douglas Adams, Tom Stoppard and all the rest of the good stuff
Alice (from Lewis Carroll) Socrates, Aristotle, William Blake, Euclid, Tom Stoppard, My Sisters and J.J. Abrams.