> If eating that pizza kills one in 100,000 though, you'd have no idea.

I'm going to guess this is wrong. I went to a large private university of around thirty thousand. I'd estimate, on any given week, the average student has eaten leftover pizza in the morning once. This alone puts us at a hundred and twenty thousand overnight pizzas consumed per month. Millions per year. At just one university! Surely we'd hear cautionary tales of overnight pizza at 1 in 100k or even 1 in a million, as deaths from it would be far more common than binge drinking.

My estimates may be off a bit, but probably not by as much as you'd think. Student organizations buy copious amounts of pizza because it's popular and cheap.