Drupal custom view mode

custom-view-mode.module

/**
* Implements hook_entity_info_alter().
*/
function MYMODULE_entity_info_alter(&$entity_info) {
  $entity_info['node']['view modes']['another_teaser'] = array(
    'label' => t('Another teaser'),
    'custom settings' => TRUE,
  );
}

/**
* Implements hook_preprocess_node().
*/
function MYMODULE_preprocess_node(&$vars) {
  if($vars['view_mode'] == 'another_teaser') {
    $vars['theme_hook_suggestions'][] = 'node__' . $vars['type'] . '__another_teaser';
  }
} 

// Duplicate standard node.tpl.php for the content type you need, like node--article--another-teaser.tpl.php. (NOTE: use underscores in template suggestions, dashes in the filename).