Humiliation:

For many, being ignored is the ultimate humiliation.

But there's also being verbally degraded, being physically peed on, being used as an ashtray or a piece of furniture, being put on display with a cowbell tied to your balls, being humiliated because of your tiny dick...

There are so many things that people can experience as being humiliating, that I could devote an entire chapter to it.

But why should I? You can come over and experience it yourself, right?
Like these two slaves, who really enjoyed a "kids' party".