Any ideas for grade 12 Physics project?

[omgwtfitsp]

I have this so called in class physics fair and its pretty much a project. But I'm having trouble thinking of a topic that is not of the common ones other people have done. Of course it has to be related to the grade 12 physics course and be within a small range budget?

The grade 12 course includes:

Unit 1 - Forces and Motion:Dynamics
Unit 2 - Energy and Momentum
Unit 3 - Electric, Gravitational, and Magnetic Fields
Unit 4 - The Wave Nature of Light
Unit 5 - Matter - Energy Interface

So if anyone has any cool ideas that they might have done before, I would appreciate hearing them out. I just can't think of what to do. And please forgive me if I posted this in the wrong section.

 

[Curl]

gyroscope - always cool and I'll bet nobody in your class will make one