There 's nothing inherently wrong with slushee-type drinks.They are easy,fun and tasty.That 'sexactly why they are terrible for a holiday work party.If you' ever had a blended Margarita or Pia Colada,you know how hard it is to know how much booze you are ingesting.Mix that with that with amateur bartenders pouring unevenly and you have a sweet,icy recipe for disaste