So, let's say you have a favorite restaurant with awesome food and a fun atmosphere. You go there all the time because it's one of those constant craving types. And it's nice, not trashy.
Let's say you went there on Saturday with your friends.
Let's say that one of you had a fly in your salad (comp'd meal and two personal apologies) and another of you was sick the next two days with food poisoning (much vomiting and wishing for death).
But YOUR food (read: mine) was GREAT.
So. What do you do? Never go again because they might actually be nasty? Or continue going because it's so dang good and there are normally no issues? I could write it off as a totally random crappy coincidence. But if I go again, I might just imagine flies in my food and not be able to eat. Or remember Kyle being deathly sick and miserable.