Q: Why did the invisible man turn down a job offer?
A: He just couldn’t see himself doing it!

Explanation: The invisible man is a book by H. G. Wells and also a movie.  If you are invisible no one can see you.  This joke plays on the phrase, “I can’t see myself doing…” which means you can’t imagine doing something, such as taking a job.  What is something you can’t see yourself doing?