I'm sure that there will be some legal catch involved, such as signing the legal contract that binds you into a minimum 2 year contract with AT&T before the actual purchase is confirmed.
I'd bet that the guy will take out the iphone and not give it to you until you hand him your credit card.
Then you go ninja and throw the credit card like a NInja star and slit his carotid artery and be like, "Shoulda gave me that iPhone. If you did that, you wouldn't be lying on the ground. Drowning in a pool. Of your own blood. You ok there?... Hello...?.... I'll just take the iPhone now......." Slowly run away
Hahahahahaha, I wonder if it's possible to have like, an account that one never has to pay for. Like for VIPs. Or how iPhones at the Apple Store, you can call people, with no charge to you.
hacked itunes--the whole change the link to the shortcut to "...itunes\iTunes.exe" -activate or w/e it was lol
I think it's still possible to obtain a copy of iTunes 7.7 "iPhone activating edition". Which would probably allow you to unbrick the iPhone.