When video recordings of Ravi Janardan's computer-science course at the University of Minnesota-Twin Cities first went online, the students loved it. Instead of dragging themselves out of bed for the 8 a.m. lectures, many started skipping classes and watching the recordings instead. Recording lectures is becoming more and more common, and many colleges are buying new products that make it as easy as pushing a button. However, many professors worry that classroom seats will collect dust as soon as recordings are available. On the other hand, proponents of the recordings say those concerns are overblown. Many professors who make their lectures available online have added incentives to keep their classrooms filled. A few tips to keep students coming to class include: (1) make classes more interactive; (2) give regular in-class quizzes; (3) turn off the camera when describing what material will be on the test; (4) wait ten days after each lecture to offer a replay, and (5) stop offering recordings if class attendance does drop.