Worker learns his lesson when he finds out who the old man he has been pestering really is 

The old man

The elderly janitor tried to oppose Jeffrey, but soon realized he was too frail to stand up against a young man like him. Unfortunately he had no choice but to undergo whatever treatment the frustrated office worker chose to dish out on him. 

The old man swallowed his pride and started to mop up the coffee stain. He didn’t realize that Jeffrey wasn’t done yet.