Take a book that your girlfriend is reading and using a pencil, underline

letters in a section of the book she has yet to read to spell out a love

letter. For example in the following exert from a novel, the underlined

letters come together to spell out the secret message "I love you"

The palace was a labyrinth, their passage through it tortuous and

interminable. Initially they passed from building to building under the

sodden sky. Miguel's feet ached; he might have laughed at himself, the

tireless traveler, grown too soft from his months in the city to walk any

proper distance. Abruptly the guards halted.

The underlined letters will make your girlfriend curious and with a bit of

luck she will write them down. Spend time to encode a proper message

such as "Dear Katie, I love you honey"