Oh, and Duke, to expound on John's definition.....they come in one of two types......"hit and runs" that post and then sit back and laugh, or experienced guys that know just how to get under someone's skin in sutble ways, and then sit back and laugh, but then, after it plays out a bit, come back for the "kill".
The later are a lot more fun.....
(okay, in a sick sort of way....
)