As one, particularly loathed, Master was found up to his thighs in Regents Park lake one lunchtime, I can claim to be part of the Form which redressed the balance slightly.
Along with many others, I used to pray for him to die overnight.
Sadistic and psychopathic is my diagnosis of him at this remove.
Various 'things' started happening in his Periods.
For example, the lights would suddenly start swinging in harmony.
The Waste basket would suddenly skitter across the floor.
(Wonderful thing fishing line!).
Ten minutes could successfully be wasted at the start of a lesson just by leaving a chair at the front.
'What's this chair doing here?'
Forest of hands.
'Don't know, sir.'
'Shall I move it, sir?'
'I'll go and ask the Sergeant (Janitor) shall I, sir?'
... and so on.
The boy tasked with removing the chair would re-appear fifteen minutes later, still carrying the chair.
'I took it to the Head, sir, and he told me to take it away'.
'Shall I move it, sir?'
... ad infinitum.
My defence is ... he started it.