Why did paypal charge me a fee?

I just received $400 dollars from a buddy. Know that this is my first time using paypal and I am completely new to this. My friend said this was completely free but after accepting the money and doing whatever paypal said on the site, I clicked accept and when I looked at the cash it went down to $380!!? piss me... show more I just received $400 dollars from a buddy. Know that this is my first time using paypal and I am completely new to this. My friend said this was completely free but after accepting the money and doing whatever paypal said on the site, I clicked accept and when I looked at the cash it went down to $380!!? piss me off!!!

Any one know why and how I can reverse it?
Update: Damnit!! My buddy who uses paypal says he never got charged a fee for receiving money. But whatever ... pissed me off!
Update 2: Take my money!