Another instance was in science class, the teacher singled me out at the beginning of the class.
Back than, the teachers used to let the JW stand in the hallway outside of the classroom and walk into class once the national anthem was over. This way, we didn't have to stay seated in front of everyone in the class. At the beginning of the year, we'd tell them about it and the teachers would usually follow that arrangement.
But not with that science teacher. She insisted that I stay seated in class. She actually went a step further, every now and than, when the national anthem was about to play, she'd say: "Everyone stand up for the national anthem. Except for Stephane. Stephane is a JW and JWs don't stand up for the national anthem."
Now, come to think of it, that's the class where one of the kids threatened to beat me up and that I wrote about earlier in this tread.