Dip it in a cup?
You go to the video rental store, pick out a nice girly movie that you know your girlfriend will like. You come home, she puts it in, and brings out the liquor and stuff. The movie is turned on. Suddenly a half hour later you realize that the movie doesn't make sense. The more you watch, the more it continues to not make sense, or it's flat, or it's plain plain bad. You have to wonder, is it the movie, or might it be the liquor and stuff?
The next day, out of a masochistic curiosity, it gets watched again. And you realize that you called it right the first time. It's just plain freakishly bad.