Mine was when I was about 19....in west Texas. I helped a buddy sandblast the inside of oilfield scrubbers. You had to crawl inside these things that were about 60 ft long....and only about 48" around. It was summertime.....hotter than a SUMBITCH and you had to be in full sandblasting gear laying on your back...worming your way thru the scrubber. These things were on pipe rollers and they would rotate them from the outside. It was absolutely MISERABLE!