3. d4
Agree
blobafett2's "suggestion" (not sure if he was trolling) of Bb5 is not terrible but I don't think it is to our advantage to trade bishops this early.
it's a real opening, made famous by a 16th century Spanish priest, and one of Kasparov's favorites:
http://exeterchessclub.org.uk/content/spanish-torture-ruy-lopezYeah I know. I played it in high school chess club.