What household items did the family not understand at first, but were circled after use?

Which household items family members didn't understand that users were circled at first? I think there are still many household items, which are convenient for our life after all. So some household items, although we are useless at first, are not used to it, but once we get used to it, we think they are really useful to you. The family didn't understand at first, but later they did. Just like the kitchen knife used for side dishes, it is the same as the toilet stool in the most common stress. At first, everyone hated this toilet, but after using it, everyone thought that this toilet had the advantages of his toilet. At first, it was very convenient for the family to understand, but it was very pink after using it. I think there should be a lot, such as shredding potatoes. Family members think they are good at fencing. This kind of thing is unnecessary, but after using it, they use special powder.