Sorry, I rushed submitting this to Instructables. One of our co-workers took a week off of work, and we had been playing pranks on each other for months. Whenever someone had left on vacation, we would either cover their desk in tape, toilet paper, or whatever we could find. Right before this prank, instead of trashing his desk, we really cleaned up his desk. Well as a final and grand prank, we decided to take 5 days to cover his entire desk with aluminum foil. (and no we did not do this during work hours, what kind of employee would I be if I did that : ) The office stayed "as is" for a few days and everything was fully functional. Then he started going (mentally) crazy with all of the reflections and tore it all down. The foil ended up as huge foil balls.