The experiment with the nasty girls continued in the weeks following Spring Break, with me arriving early to class to steal their seats. The first occasion resulted in lots of whispering and glares, which gave me secret pleasure in knowing I had "gotten" to them.
For the next couple of classes, they arrived after me, forcing them to sit on the other side of the classroom. I have given up with getting up early just to spite them (30 more minutes of sleep!), so they can have their seats. The point was made and it was surely satisfying.