I've met them everywhere in my life. Every time my mother comes back from shopping in the supermarket, I will carry it with my hand, roughly estimate its weight (how many grams or kilograms), see how much it differs from the actual weight, and then write it down in my notebook.
Today, I also met an interesting thing. My uncle came to my house for dinner and said that he had lost weight again and his weight had become 65. I think: is it 65 kg or 65 kg? If it's 65 kg, it's more than ten kg heavier than me. Then I asked my uncle, "Uncle, your weight is 65 kilograms, right?" My uncle said, "Yes, it is 65 kilograms, which is equal to 130 kilograms." I had a false alarm. If I take it as 65 kg, how thin it will be!
Let's see if "grams and kilograms" are very important to us. We must make good use of them, or we will make a joke.