Apparently a fat controller contributed to what almost became a complete nuclear meltdown at the 3 Mile Island nuclear power plant in 1979:

"The valve position lights for one block valve were covered by a yellow maintenance tag. The reason why the operator missed the lights for the second valve is not known, although one theory is that his own large belly hid it from his view."

https://en.wikipedia.org/wiki/Three_Mile_Island_accident

Three Mile Island accident - Wikipedia

@jelly

Thomas was very pleased that the fat controller did not cause a nuclear meltdown.