I've worked on/operated a number of odd machines included a plutonium powered Mars rover but the most amazing for its time and terrifying to operated was the John Deere 55H sidehill combine. On a steep sidehill one of the big front wheels would be up as high as the operator platform, the other as far down as the water from the high dive. It wasn't so bad traversing the contour but the turns where where you really put your faith in the JD engineers when all the leveling process was in motion moving one wheel up and the other down. The power steering on our old machine (it was old in the late '60s, don't know when it was made) wasn't great and cranking the knob on the wheel would give you blisters. The machine's nickname was The Green Hornet.