My client regularly downloads thumbnails off of Google Image Search and emails them to me to post on his site.

Me: “I’m sorry but I can’t post these on your site.”

Client: "What? Why not?"

Me: “For one thing, that’s copyright infringement, which is illegal, and for another, these are WAY too small to even be of any use.  You need to use your own camera and take photos of your workers, your vehicle, and other things you want on your site, or have someone do it for you.”

[Client proceeds to take pictures of pages in magazines and email the photos to me.]

Me: “…These won’t work either.”

Client: “Why not?  You said if I took pictures with my camera, it’d be fine!”