Use a shutter speed you know won't freeze your subject. It might work, it might not, but you'll never know if you don't try. There's no such thing as a failed image, since all images inevitably lead us somewhere interesting. We've already said that a camera is more than a recording device. It's a tool for a photographer, just as an instrument is a tool for a musician.
All photographers use light to make images, and all musician use notes to make music.
Let's face it, The Beastie Boys have something way different to say than Mozart. We proved this when everyone photographed a roll of toilet paper. Each student's vision showed through his or her interpretation of that common object. We had elaborate still lives and minimalist constructions and collaborations with nature. It's all about vision and voice.