Testing the Electrical

I think the pic says it all, but just for those that may not see how this happened> ALWAYS, ALWAYS, ALWAYS turn off the breaker before attempting to remove a wire from a switch, socket, etc.! Don't worry, I'm still alive. It actually didn't even shock me, but made a hell of mark in the screwdriver.

But let me go back to the begining on this project real quick:
So I was done wiring the garage and needed to test it out...

Step one: Turn on breaker to garage
Step two: Turn on breaker in garage (all systems are go)
Step three: Flip light switch to "on" position
Step Four: Try to figure out why there was a loud pop and all the lights went out in the garage...and my house...and the other houses on my street. Ok, so I didn't kill the whole street, just my house. It was basically some mis-wiring that I looped like 240V back into itself somehow. Remember...I'm not a professional.