I don't get PMs very often so my reaction is normally something like Someone finally PM'ed me......Bout damn time! Unless it's from a staff member, in which case i start panicking. I PMed Nephany for a sig and avatar request once, yet because of her modship i expected the reply to be a telling off 
				
			
 But I'm not bothered 

 However, if I feel uncomfortable with the sender, or on/from a website/forum where there's a bigger chance the message is a negative one, I'll usually delete it without reading.
 Did I do something bad?'