Hardest was a summer of concrete work.
Best pay but scariest was making propellant for Mighty Mouse & Zuni rockets.
That crap could blow you up even if you were careful, and the nitro in it made you sick.
I think it was a Zuni rocket that launched on the carrier deck in the Viet Nam war that almost sunk the ship.
Most interesting was final arrangement sales at a cemetery. You will absolutely meet all strata of the population.