How much for a dozen?

I know, I know, they're talking flowers, but it's such a nice visual viola joke...

Here's another one from a tremendous catalogue:

Why do violists stand for so long outside their houses?
They can't find the key and they don't know when to come in.

And, just to be fair, one more:

A conductor and a violist are standing in the middle of the road. which one do you run over first, and why?
The conductor. Business before pleasure.

Your own favorites welcome as comments.