function mt_smart_excerpt(){
 $content = get_the_excerpt('');
    $dot = ".";
    $position = stripos ($content, $dot);
    if($position) {
        $offset = $position + 1;
        $position2 = stripos ($content, $dot, $offset);
        $one_word = substr($content, 0, $position);
        $two_words = substr($content, 0, $position2);
        echo $two_words . '.';
    }

    else {
    }
}