An old girlfriend Patricia and I were living in a shared flat with a bunch of other people. One night someone volunteered to cook a meal for everyone. Soon after the meal both Patricia and I were violently ill. Clearly the cook had not been sufficiently hygienic. We just shrugged it off as a typical shared-flat situation.
Another time Jenny and I were at a friend's wedding, and we gorged ourselves at the wedding reception afterwards. When we got home later we were both sick as dogs. Of course we didn't tell our friend about the food poisoning, she would have felt very guilty and it would have spoilt the day for her. I imagine some of the other guests must have had food poisoning as well, but when we saw the friend later she never mentioned it.
Then I got food poisoning on a flight to Australia. By a weird coincidence, the woman sitting next to me also had food poisoning, so we were able to deduce the cause - the egg sandwiches we had at Costa Heathrow. Boy, was I glad when that flight was over!
I love peanut butter and eat loads of it, but I read that peanut butter can easily be contaminated by salmonella, either during the growing period or during later processing. There are regular recalls of peanut butter in the States. Well, I've never heard of a peanut butter recall in the UK, so I guess it's safe for me to go on eating the stuff.