I have always struggled with the first day of class, and often chose to go the "tough teacher" route of seeming very strict and no-nonsense. I decided to take this approach after dealing with a very difficult class of high school seniors, figuring I could always lighten up later if I could see that the students were going to be well-behaved. I love some of the ideas everyone has posted, especially the topics about ice breakers that really could be fun. Thanks!