My brother eating a banana would be an excellent example. When he realized I was irritated by it, of course he exaggerated it even more! Big bothers...
Don't get me started on food noises! My wife can't eat with the family because my kids don't have perfect manners. They tend to chew with their mouths open more than they should and smack a bit. When she tries to eat with us she spends the whole time nagging the kids. And she'll leave the room if I start eating sunflower seeds because of the noise. And yes, I do use that to my advantage!! ;)