Being a mom or dad is one of life's greatest joys. But early on weekend mornings? We're not always feeling the joy so much. In a series of Vine videos now going viral, one bleary-eyed dad captures the truth of Saturday mornings as a parent. Tony Serafini, a 38-year-old dad from Leominster, Mass., spends Saturday mornings alone with his 4-year-old daughter after his wife and eldest daughter leave for dance class. He started shooting a series of videos showing the little girl rocking out to her favorite music in the background, while dad blearily waits for his caffeine to kick...