I think everybody pre-college should work a summer job at a supermarket or a store at the beach or something like that.
I had a summer during college where they weren't really hiring but they felt like they owed me a favor so I got assigned underneath the store managef to do whatever random tasks he needed, this included
* learning how to work the meat slicer and filling in in the at deli
* sweeping the floor of the whole store
* helping out in the bakery
* painting a metal stripe that went all the way around the store
later when I worked in startups this helped me have the ethos of doing what the organization needed and not complaining that this or that wasn't in my job description.
