I like the ones that direct you to a web page where you are supposed to fill in your account details, pin number, passwords and so on.
I have loads of fun filling in the boxes with the most obscene, hateful, poisonous messages I can think of. I'd like to think some of those parasites will actually read it- or if not them, the law enforcement agencies might get a giggle out of it when they seize the scumbags' computers... I don't know. Makes me feel better. If only I had Ennesby's way with words:
http://www.schlockmercenary.com/d/20030520.html