*** EDIT - Aww crap, Hozer, you posted first ***
You shoulda waited - there is a lot of advice on the board about doing this properly... search.
You done broke it off. Now, you'll need the special tool and Ford's procedure TSB to remove the remnant. Sorry about your luck, man.
Hi Hozer. Hey, nice handle
Anyways, Joey is right, because you'll see you are using the wrong size socket.
The 5.4 3V V8's use a 9/16" plug.
BTW - Didja catch up on all the reading on the spark plug change advice?
I recommend you do so - may save you some grief.
PS - nice to 'see' you again, Joey