High School Film Festival Ideas?

I'm in Grade 8 and I want to join the MAD Film Festival. The film needs to be about 5 minutes. It has to have an object that it revolves around. I will also have a theme but since I only have 4 days to film edit and write this thing I'm brainstorming beforehand. My equipment is a Nikon D3100 and a tripod. Can you suggest any ideas that would be interesting to do and can involve less than 8 people?

Anything and everything. Main thing to remember is to keep it simple.
Go to: http://www.thesmalls.com/ and watch some short films there. After watching a few, I'm sure you'll get an idea that you can pull off.