X2 on hating heights.
There's a bi-annual survey point at a regional nuclear power facility that requires climbing the ladder up the side of the cooling tower. Heights are already bad enough (get tense on roof of my ranch house), but when the pull of gravity is back AND down (after passing the midway "waist point of the cooling tower) things REALLY get bad.
But then, doing environmental sampling in Lake Erie and getting a school of shad caught in the seine is pretty bad too. They're not a sample species, they're small, get tangled in the net, and pop when you try to de-tangle them. After an hour or so, you're covered in shad scales and doused in shad juice.