It so gets to me when clients says...

[Morbid Angel]

Yeah, get that one a lot. I also get the similar..."can you make the glass more see through but we don't want to see anything on the inside."

Vlado can we add sheen parameter to vray Mtl?

[Morne]

Vlado can we add sheen parameter to vray Mtl?

And have a parameter that we can edit the label, according to what the client likes to call it

[crazy homeless guy]

I am going to play devil's advocate.... I find that it is just as common for the artist producing the scene to not understand what is being asked as it is for the client asking unreasonable things.

[AlexP]

I am going to play devil's advocate.... I find that it is just as common for the artist producing the scene to not understand what is being asked as it is for the client asking unreasonable things.

Indeed, although I think its commonly down to the client not being able to explain what they want. I always get clients to send me reference imagery for anything that seems a bit odd, and more often than not they are using incorrect terminology so we are misunderstanding each other.
I have one designer that consistently uses Opaque to describe Translucent material for example, but now I know what he means.