Servant: The customer
The client, begging and pleading for the support guy to help him make the software stop crashing long enough to get the job done. The master knows he has complete control over customer and he could ask him to make barking noises like a dog if he wanted. The phone support guy is truely evil, he knows he has the upper hand and this is the only pleasure he gets in life, it lets him feel more powerful
The final image, structured in a comic book style (although not toon rendered) with different cells for each character to show their locations.
Quite a light hearted image, certainly no deep meaning to the image, but its something most can relate to.