Client: OK. We've run the website past our test users and based on their suggestions, we want the outlines of the menus in black and the font colour to be dark blue, to match our company logo.
Me: OK. No problem.
(2 weeks later)
Client: can we change the menu outlines and font colour to light green ?
Me: won't that clash with the logo and make the text hard to read?
Client: We're changing our logo, so we want the font colour to match.
Me: it'll still make it hard to read (the colour they wanted was #B6D941 - look it up)
Client: Just do it.
(2 days later)
Client: we're getting complaints that people can't read the text on our website.