I originally uploaded the Wits & Wagers U.S. History flipchart activity on Promethean Planet, but have since moved it to my Dropbox for easy download. It includes 10 questions with fun facts drawn from well known moments from Columbus to the Civil War. It will be easy to create your own slides with similar questions related to the day's lesson.
If you don't have ActivInspire or a classroom response system such as Expresssions, you can easily adapt the concept to the resources you do have.
If you haven't seen the other Wits & Wagers flipchart yet, it's here with 10 questions based on Life Science facts.
And the Oh, Really! Government Edition is also worth checking out if you're looking for a good activity for discussion in a Civics or Social Studies course.
The original party game Wits & Wagers (and the spin-offs...and other great games) is a highly entertaining party game from North Star Games, so be sure to check out their website.