Worst I've ever had is "No.".
I don't push, though... There are too many other cars out there for sale for me to want to waste my time on one person.
I make an offer, state my case, and wait for a response. If it's no, I take my cash and walk.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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