Client "The colour you have used looks to green for my liking"
Me "Maybe you should recalibrate your monitor to see it properly"
Client "no theres nothing wrong with my monitor, its the colour, so please change it"
Me (having done nothing to the colour) "There, try that"
Just goes to show that people can't just let you get on, they have to feel like they've made all the decisions no matter how minor...