The things i'll need to measure in people after they drink the energy drinks will be:
- heart rate
- blood pressure
- any side effects that may or may not occur
- take clear photographs before and after drinking the energy drink

Okay, I think the "How energy drinks affect you're heart rate and blood pressure" experiment sounds good.
I'll need:
- about 30 people
- a range of energy drinks (V, Mother, Red Bull, Rockstar, Monster, etc)
- a blood pressure measuring thing
- a stopwatch

Ideas

Well, all my previous ideas were mostlt to see what burned more effectively. But then I realised that they were all very short term experiments.

Now I'm thinking of things like, if being soaked in water and other substances affects the stickyness of contact. And if energy drinks have an effect on heart rate and blood pressure.