Wave your arms around. And hit the desk loudly, many times.
This. It got me an A for a speech I did about paper consumption.
You should do a report on the science of black holes.
Wave your arms around. And hit the desk loudly, many times.
Link
As for the video games speech, you could something along the lines of how certain games affect kids. In my Psych class today, we were talking about how violent video games may encourage kids do actually commit the crimes, whereas some kids have the common sense to deviate what is real, and what is just a video game.