There are certain types of rubber/plastic that do this when they degrade, as others have mentioned. I had a small HDD with a rubberized coating on it and rubbing alcohol started to speed it’s degradation and it was a horrific mess. I also had a rubber mallet from a discount tool store that started to stink so bad, and it too was sticky and degrading. And (oh, you thought I was done…) I had some small Rubbermaid totes that I purchased at Walmart over 15 years ago that started to feel greasy and sticky when I touched them. I washed all of them multiple times until I realized the plastic was not cured and was breaking down. At least those did not stink. They only lasted 1 year before that happened.
Instead of sleeping in a cave and spending all day trying to kill food with a sharp stick, you can use your pocket internet to have food delivered to your door. In your very comfortable living space. Thank you Science and all the smart people in history that brought us here. Life is not as bad as the losers would have us believe.