Introductory PPT as well as a slap game. Be sure to check this post every now & again as I'll be editing it if/when I make more files for the later parts of the lesson.
All Periods Intro: Pretty self explanatory. (Ideal for all periods)
Slap game: Divide the class into two teams, 2 students come up to the front and have their back facing the TV screen with fly swatters. Everyone asks me "When is your birthday?" I answer "It's on ____." Both students then turn around & the first person to slap the correct date on the TV using the fly swatter gets a point for their team. (Ideal for the first or second period)