Carve
There is a circumference around someone's hair, as in, you can see a circle drawn around the top of their head. As you examine it closer, and pull at it a bit, you realize that someone has carved the hair off someone's head!
Their hair has literally been carved out of their head, and you discovered it. Of course, the nastiness, the smell, and the feel should be applied to your imagination to make the mnemonic stronger.
ちょう
ほ
None
When you think of all the people who could have done this... all the people who could have carved out someone's hair, only one person comes to mind, and that is Mrs. Chou (ちょう). She's the only person evil enough to do something like this.
You can also imagine Mrs. Chou doing the act of carving someone's hair out, but that may just be too much.