I hate selling stuff.
How about when you are selling services and you start high knowing the cheap *** is going to cry like a baby until you come down to your "real" price anyways so he thinks he just became the "bargainologist" of the year, then he asks if he can supply his own parts.
At this time I usually say the deal ender because I am already fed up with their crap and don't feel like doing anything for them at this point so I say "Do you buy a steak at Krogers, then take it to longhorn and ask the chef to grill it for you at a discount?"
Usually I walk away smiling as they are swearing or staring into oblivion>>>>>>>>>>>>LOL.