Client: Hi. Do you do Photoshop?
Me: Yes, I'm proficient with Photoshop. How can I help you?
Client: I wanted to know if you do logo editing?
Me: Logo editing?
Client: Yes. I have a professionally-made logo, and I need it edited.
Me: I see... Well, what changes are you looking for?
He sent me a low-res logo with a watermark.
Client: I need the semi-transparent thing over the main picture removed and the blurry edges made better.
Turns out, this client from hell had contracted a fellow artist - who is a friend of mine - to design a logo. The client bargained his way into paying 10% upfront instead of 50% like my friend usually charges, then after he was satisfied with the logo (which still had the watermark), he thought he'd be clever and tell my friend his work was inadequate and wouldn't pay the remainder.
Unfortunately for him, the first person he tried was me. I immediately informed my friend, who warned the client from hell not to try using his work without paying.
Client from hell ignored the warning, presumably found some other guy who was willing to turn a blind eye and help him (badly) remove the watermark, then used the blurry low-res image anyway. My friend tried lawyering up, but apparently, it wasn't worth it. Now he refuses to waver from his 50% upfront policy.