The one that impressed me the most and still is the one where you get a phone call from "microsoft", the person on the phone tells you that your windows is about to expire.  

What kills me on this one is that I don't use windows, so I one time proceeded to ask them for details on which windows machine it was, what the IP address was, what the computer name was, eventually they hung up on me.  I did receive this same sort of call while I was working for Wells Fargo too, did the same thing there too.

All I have to say is people be smart and think about what they are telling you, MS is Apple and Google(well Google could be) are not tracking your emails, the processing power to track every email in the world is astronomical, so if you receive an email saying that if you forward an email you could receive a reward, don't believe it.

And don't fall for those internet pop-ups either telling you your computer is infected.

You just need to be smart, and if what they are offering is too good to be true, then it probably is.