Airclues
Of course there's no way that I'd do this, but I'm interested to know what would have happened if I did.
They would have planted a backdoor trojan/rootkit to enable them to return at a later date and/or make your computer part of a zombie network.
Piltdown Man
How about bombing these guys with emails?
Only if you wish to find yourself without an internet connection. ISPs quite rightly take a dim view of "email bombing" and will cut you off, no questions asked.... it is classified as a form of DoS attack.