I had to stay in a hotel last night. This morning as I was packing up I saw all the mini shampoos and conditioners which I hadn't used because of course they are shit and I thought of this thread. I stuffed them into my bag.
That's actually not that bad. They're put them there expecting them to be used, so if you haven't and they haven't been used, I don't see a problem with taking them. Which was done at my last hotel stay as well...