Actually, I kind of like it. The only thing I might do is change wiggles to is wiggling.
As for what I would do in that situation, I'd just shove the ol' finger right up there. It's the students who should worry about what I think of them, not the other way around. Besides, I teach in a prison. Anyone who is offended by nose picking should certainly stay out of places like that.
Student or Learner