common one is:
entire class cannot work as the network is down
one student needs his password reset
headteachers printer doesnt work
which one do you deal with first and why.
According to my school it would be 1, 2, 3 as everything has to come down to teaching and learning that directly effects the students.
However in the real world I would be shot if I did 2 before 3. I MIGHT get away with doing 1 first!