I usually introduce the course objectives during the first class and then have students break into groups of two. I give each person in the group 2 mins to talk about what they did during their vacation while the other students listens. Then I have them reciprocate. At this point students are thinking that I will probably test their memory by asking them to state what their group member did for vacation. Instead after 5 minutes I have each group member describe in a nice way the physical attributes, eye color, hair color, clothes and so forth of their group member and have them share eachother's response. It is interesting because the group members become so preoccupied with memorizing what each of them did for their vacation that they forget to pay attention to the physical attributes. It ends up being a fun ice breaker for the first day.