can someone come up with a script that makes a game object explode and destroy itself on impact with the first person controller?
I think you should go and check out this free website for Unity beginners.
http://www.unity3dstudent.com/
Its full of great examples and I believe once you have seen most of them, you might have the answer yourself - or at least most of the answer.
Then when you have written some code yourself and understood what it does, then ask us here again and we will try and fix your code (if its minor details).
We are not here to write your code for you. But I have a Paypal account if you want to pay me for spending my time on your project? Just to be warned: its money in advance! :o)
You can check out Tornado Twins tutorial . I think it will be useful. And it is one of a great place to start with.