I work with 7th graders and I'm always saying to them "I know every trick in the book". I bust them every time they try to copy an assignment or cheat. Last week we were doing an exam and one of my students said "Can I get a drink", he was gone a very long time. I said did you run to your locker to look at your notes? He was astounded that I figured it out. Whatever, I let it slide, he still was getting a lousy grade!