i agree. I can't teach them anything, if i can't get them to come into the classroom. Retention is one of main focuses. Getting them excited to come back the next day by giving them a cliff hanger type question at the end of the day is one way we facilitate this.

I have also had success in this format. Most of the students I work with are extremely competitive and enjoy in class competitions. I use this during the last day of class because not only does it give them something else to do besides listen to me talk, but it also gives them a chance to review the material before they move on to their next course in the college.