Final answer:
The boss' response to the sewer worker when he went on vacation is meant to be a humorous punchline, and can vary. One possible response could be, 'Enjoy your vacation, but don't forget to leave out your work boots so they don't smell up the office!'
Step-by-step explanation:
The question is asking for a possible response from a sewer worker's boss when the worker went on vacation. Since this is a joke or riddle, there is no specific correct answer because it is meant to be humorous. However, a possible response could be, 'Enjoy your vacation, but don't forget to leave out your work boots so they don't smell up the office!' This response plays on the idea that sewer workers deal with unpleasant smells.