I designed new business cards for a client’s company. As soon as they were ready to print:

Client: On second thought, I don’t want them.

Me: You’re keeping the old ones? Why?

Client: They’re easier to read.

She pulled out her card to show me. Vertical orientation, name in bold 10 pt red, contact info in 4 pt black.

I pull up my design: the contact info is horizontal orientation, 14 pt white on black. Crystal clear.

Me: Honestly, I think this is easier to read.

Client: I’m just not crazy about them.

Me: But you said you loved them when you first approved the design.

Client: Meh. I lied.

Source: Clients from Hell