def getRandomDeliveryAttachment(Integer probability = 25) {
    def deliveryImages = [
        'https://media.giphy.com/media/UtM8DmnahknE4/giphy.gif',
        'https://media.giphy.com/media/11VKF3OwuGHzNe/200w_d.gif',
        'https://media.giphy.com/media/d5pGYhWb3T1Hyyl8OB/200w_d.gif',
        'https://media.giphy.com/media/oTSy3rHigPd9S/giphy.gif'
    ]
    Random rnd = new Random()
    if (rnd.nextInt(100) < probability) {
        return [];
    }
    def imageUrl = deliveryImages[rnd.nextInt(deliveryImages.size())]
    return [[title: '', imageUrl: imageUrl]];
}