Tins and jars that have texts telling what's inside them.
Like sugar or cookies painted/printed to the tin itself. I have no problem with handwritten labels, feel free to use them if you like. But if the designer of the pot thinks s/he can tell me what to store in that particular one, it just makes me mad. Therefore I never follow those "instructions", vice versa. We have biscuits in a jar saying sugar, semolina in a tin meant to coffee and rice in an old liquorice box. So if you visit my home and find white stuff in a pot named salt, the only thing you can be sure about is that it doesn't have anything to do with seasoning.