You could give them someone else's flight gear, of which they can fvck up, gouge the visors, and generally make your life miserable when you are trying to figure out who fvcked with your sh!t.
Sure, but "technically" (read by the book), you're supposed to get hung in a harness before you can go flying with it. Regardless of how it goes down in the fleet everyday, I'm thinking that whomever is supervising what amounts to incentive rides for civilians would make sure that everything is done 100% by the book.
Brett