Luckily, no Korans were blown up, only the teacher. We can only hope that his replacement will be similarly talented.

From here:

JAKARTA, Indonesia (AP) — A man reportedly trying to show students how to make explosives was killed by a homemade bomb inside an Islamic boarding school in Indonesia, police said Tuesday.

School officials and students have prevented police from entering the building since Monday’s explosion, local police spokesman Lt. Col. Sukarman Husen said.

This takes me back to my schooldays in Wales: first period, math; second period, English; third period bomb making.