I worked the summers between my junior & senior year and my senior & freshman college year. Those jobs were not internship related to anything I eventually planned on studying on in college (one summer at a steel and iron manufacturer the other at a company that manufactured gas compressor units for the oil field). They were great jobs because #1 they kept me out of trouble & #2 I was able to learn certain things in the world that even if I didn't ever use them again in my life that I'd be able to respect the men that do these kinds of jobs for their life's work. It also taught me responsibility--which is a good thing to have when you go off to college. And yes, the extra cash flow was a bonus.