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The Galactic Teacher CAO-2 spanks Ran in episode 85 (or S5E8 or S3E5, depending on broadcaster). Lum explained us that's a sort of a galactic grammar teacher, whatever that means, and we are introduced to the good old times, when Lum tricked Ran into troubles, even while at school. Now CAO-2 seeks revenge. And gets some!
I remember this one. The robotic teacher is actually designed in the shape of a blackboard eraser.
Contrary to what ghitulescu said, the grammar school flashbacks were actually of Ran, Lum, and Benten getting into trouble in school and being disciplined by CAO-2. They always tried to get back at him for this, only to make things worse for themselves (Think three small coyotes and one large road runner here.).
The threesome finally succeeds in their quest, trapping the teaching robot on a planetoid. He finally escapes and goes after his wayward students. His programming doesn't allow him to see them as teenagers, but still as grammar school aged girls, and he treats them accordingly. This is what he does to Ran, after taking an antimatter grenade from her hand.