This is by far one of the best threads I have ever read!!!
I actually had a "while you are here" clause written into my bid sheets!!
"I am not liable, and I will charge you extra, if you or you're spouse comes and asks me to do above and beyond what I have bid. If I am told to do it, no price will be disscused, it will be figured and added accordingly. If it is disscused, I will figure a number and give you another bid."
People will suck you dry with that crap!!!