Roger: Rule #1: Make sure you know everything about those you visit. 2: Never spend more than 10 minutes. Every extra minute increases the chance of someone returning home unexpectedly. 3: Do not leave DNA traces. 4: Don't waste time getting an expensive reproduction. Even a simple forgery will go unnoticed for weeks. 5: Sooner or later, one of two things will happen. You find a work of art so valuable that you never need to worry again, or... you'll get caught.