Prove what you believe

If you believe that you have a Komodo dragon in your garage, and I ask you to prove it, you can show me the Komodo dragon, and I too, will believe you have a Komodo dragon in your garage.

If you believe that you have an invisible fire-breathing dragon in your garage, and I don't believe you, can you show me so that I will believe too?

I'll wait for an answer.

Update:
See this concise summation of the dialog above at John Kieffer's photos