I always love (sarcasm) what too many clients do after I request a vector-based version of their logo instead of the dopey low-rez JPEG image they sent on the first attempt. A couple hours (or days) later I'll get an Adobe Illustrator AI file or an EPS, PDF or even CDR file containing the same dopey low-rez JPEG image.
"Vector-based art? What is that!?"
Even more fun happens if they have no vector-based art of the image. We offer to re-build it in vector-format for an hourly rate. Some customers are so cheap they would rather us print that low quality JPEG image than have a professionally sharp re-creation of it on their
sign.
Here's another funny (or anger inspiring) example: low resolution photographs provided by customers to print on large banners,
signs or even billboards. When we ask them for a higher quality version (such as a copy of the original camera image) they'll sometimes send us a much larger version of the image.
But that much larger version turns out to be a very soft, artificially up-rezzed copy of that low resolution image.