San Telmo Plaza Dorrego - Wikipedia Images
"There is always an elderly, overweight, Argentine guy in a suit who slowly dances around the edge of the dance floor, and all he does is walking and maybe an ocho once in a while. And he has usually an amazingly beautiful girl who dances incredibly well plastered all over him. Be that guy.
"There is also always a someone on the dance floor who wrestles his partner through all kinds of maneuvers, interrupted only by short pauses where he repeats a move 5 time till it "works", or where he explains just exactly how the follower has to move to make the 40 step sequence he wants to do work. Note that he dances mostly with beginners. Note the frozen smile on his partners face. Don' be that guy."
Still one of my favorite quotes about tango, originally from Dance-forums.com - http://www.dance-forums.com/showthread.php?p=514203