Are you ever annoyed by the way WordPress pingbacks when you add an internal link to a post or page? The following code snippet will stop self-pingbacks in their tracks. Add it to your functions.php and give it a try.

/* No Self Pings */
//Pass the variable by reference to the function, so the function can modify the variable.
function no_self_ping (&$links) {
$home = get_option( 'home' );
foreach ( $links as $l => $link )
    //Find the position of the first occurrence of a substring in a string.
    //($a === $b) Identical operator. TRUE if $a is equal to $b, and they are of the same type.
    if ( 0 === strpos( $link, $home ) )
        //Unset the variable
        unset($links[$l]);
}
//Hooks the function to the specific action (pre_ping)
add_action( 'pre_ping', 'no_self_ping' );