ALDI cereal kinda like Quakers muesli but with chocolate and coconut, and more sugar - it was situated kind of in between the "boring" adult muesli/granola/etc and the "sugary" kid cereals.
When they discontinued this, I kid you not, ALDI saw their gross drop by almost 10% - it took literally years to completely recover. Not because this single cereal was 10% of their turnover, of course, but it turns out it was one of their biggest loss leaders. Kids were always asking/begging for
breakfast cocain Kwakies and when this disappeared, children were angry with Aldi and parents no longer had a reason to go there over other discount supermarkets.
They re-introduced them 5-6 years later, but with another recipe, and of course all the children who were into it had moved on and the new generation didn't have any attachment.