Ahmadinejad's sudden promotion may be driving him mad. He think he has a halo but his crack down is waking up Iranian student. See them erupt in Tehran here and here. The immediate reason for the wrath is their opposition to the appointment of a new university president:

Students at the University of Tehran refused to attend classes in the morning and gathered outside the campus library to demonstrate against the appointment of a cleric as the new chief of the university. Ayatollah Amid Zanjani, a notorious religious prosecutor in the 1980s, was installed on Sunday as the new university chancellor. His predecessor, an academic, expressed surprise at “the unprecedented haste over the transition”.

The students chanted, “Appointed head, resign now!” and “Even if we students die, we will not accept humiliation”.

As protests got heated several students pushed the ayatollah and threw his turban off his head.