This is a REALLY old episode..it's the Halloween episode. Remember in the beginning when Dru and Stu were building the "haunted house". Grandpa says that in his day, there were REAL ghosts, and REAL goblins. Notice in the end, when the babies are done scaring every kid in there, Grandpa tells his sons what Angelica saw was true, and Dru says, "I thought you were used to real goblins." (or something like that) Then, Grandpa says, "Well, that was now, and this is then.." Grandpa needs to learn his "now and thens".