By the time you hear it, it's too late to do anything about it. A long list of viola jokes:
M'llenium
Whenever he had the energy, he didn't have the time.
You have to drop the bomb twice.
Everywhere.
The police heard it was full of pedal-philes.
He heard the ref was blowing fouls!
Play in the low register with a lot of wrong notes.
A violator.