WMG / Beavis And Butthead S 7 E 33 Breakdown

This episode takes place after "Steamroller"

In that episode, Beavis and Butt-Head destroy the school with the titular steamroller in a quest to find Todd, until Stewart informs them that he dropped out. The main room destroyed is the teacher's lounge. At the start of this episode, which could take place shortly after, Beavis and Butt-Head are in McVicker's office for destroying the teacher's lounge, and this sends him over the edge.

---