None, that's what students are for.
Only one. Just as long as you hand him the damn lightbulb.
Just one but he wants to do it thirty-two times and when he's done everyone thinks that his last lightbulb was much better.
Two. One to change it and another one to change it back again.
Reptile - disfunction
When it's turned into the teacher.
Maths teachers, they make everybody count.
He knew that some of them wouldn't miss the blind...
Student:I don't know. Teacher: Bark, my child, bark. Student: Bow, wow, wow.