scala> val l = List("cat","dog","frog")
l: List[java.lang.String] = List(cat, dog, frog)

scala> Random.shuffle(l)
res8: List[java.lang.String] = List(frog, dog, cat)

scala> Random.shuffle(l).take(2)
res10: List[java.lang.String] = List(dog, frog)