A very small amount for fermentables can produce a huge quantity of foam. When the yeast start to rot and autolysis, you will know by the smell.
Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"
"I would like to die on Mars, just not on impact." Elon Musk