People that don't eat or throw away the green from the Cauliflower. It tastes so good!
or people who pick the nuts off the top of a cornetto.
tipping away the milk left after the cereal is finished. Especially if it's chocolatey flavoured!
When people mash their Weetabix up with milk like a baby. It's especially bad if they put it in the microwave because the smell reminds me of my child minder doing that for the babies. It just makes me think they're eating baby food.
Distribution of Ketchup on chips - if you order chips for takeaway (open), and apply the ketchup in the shop, the result is a top layer heavily saturated in ketchup, the next layer perhaps optimal, but the rest with little ketchup left for them.
Beans/peas - the temptaion can be to empty the pan onto the plate, which ends up flooding the plate with sauce/pea juice. Best to strain them.