Especially when they feel the incessant NEED to rub all up ons you.
The people who believe that people own cats have not been in the company of one for long... Mine [if I can call her "mine"] does exactly the same thing, including rubbing against any and all clothes laying out. To keep something cat-hair free, it goes in the closet. ...Which she has learned to open unless it's latched shut.
I have a white dog (Japanese Spitz) called Momiji. She does exactly this. Comes and gets cuddles, leaves hair all over me, then trots off to do other happy things.