One of my favourites, "well we don't have a big budget for this project, but listen......(voice usually drops a little in volume to add drama) I've got this other one coming up, and it's a much better budget and I can get you on it, if you can do this one for me at the ridiculously low rate I'm asking of you !"<<<<<<<<<<<<<<<<
The perfect answer is; "Tell you what, you pay me my rate for this job and I'll give you a discount on the the big budget job"
Eric