Actually,Homer,it can happen and has happened.
Trust me on this as I have over 25 years in the food industry,my
brother is a food scientist,and my best friend is head of food science
at a major university.
Claustridium botulinum is an anerobic bacteria and if the spores
are present and the foil makes an airtight seal and all the factors
are"right" ,then the toxin can form and it is vewey vewey deadly.
So deadly in fact that a former middle eastern dictator had a lady
known as "Doctor Death" playing around with it but there is no
evidence that she was using spuds.
So proper food safety is a must;particulary when you are in the
wilderness and there is no easy access to medical assistance.
In all probability I would say contaminated GORP and water has
a higher chance of affecting the average person.
Oldfivetango