Recently, I have tried to come up with different ways to end class. The videos have worked well. The other idea that I have used is perfect before an assessment. I have each table of students (3-4) come up with the hardest question that they can think of to stump the rest of the class. I usually do this with about 8-10 minutes left, and we usually only get to two questions. The kids enjoy asking and answering the questions.