You beat me to it.I think we've already covered the Poop Knife elsewhere...
I used to think about being attacked in the shower. The truth is, unless they intend to harm you, most of the time people will come in, steal what they want, and leave with no confrontation. If they do come in, usually a minimal amount of resistance is enough to send them packing. If not, either punch or shower knife them straight in the face.