<human>: Could you distill the essence of the text into 1-3 sentences?

Yesterday I was driving home from work. All the cars in front of me hit the brakes to go past a parked cop, so I slowed down too. As we were snailing past the cop I looked over at the gas station on my right. There was an obese old lady sitting in one of those chairs that people use when they don't need a wheelchair, just a motorized chair.. you know. I forget what they're called. Anyway, she was sitting in this chair. The thing that first caught my eye was that she clearly had a recently amputated foot. The second thing that caught my eye was that she was eating a chocolate cake. I mean this lady was sitting in a rolly chair with an amputated foot outside a gas station eating an ENTIRE chocolate cake.

This is the part where I made ridiculous assumptions. I thought "You know what? She deserves that." Because my reasoning was that she likely has diabetes, hence foot amputation and obesity, and she deserves the foot amputation because she obviously doesn't bother taking care of herself, hence chocolate gas station cake. 

I realize that is horrible to think, and crazy to just assume those things when I couldn't possibly know anything about her. But my brain thinks its own thoughts. So what crazy assumptions have you made about others?
<bot>: I saw a fat foot-amputee eating an entire chocolate cake and assumed she had diabetes and deserved the loss of her foot because she did it to herself.