100K Challenge, A dragon in my pants, the SMAD, and evidence

There was a dude recently who challenged atheists to prove god does not exist.  To illustrate the flaw in this thinking, I'm reminded of an old debate blog I did years ago.  A far less charismatic person gave me the exact same challenge.  This brought about a new religion I made up that involved a dragon in my pants, and the Super Mega Awesome Dragon, later dubbed the SMAD.

Why is the demand to prove a negative stupid?  Why should extraordinary claims require extraordinary evidence?  Why does no one believe I have a dragon in my pants when no one can prove I don't have a dragon?

Plus your calls.

The SMAD aprroves