for a teacher of "regular habits" enter the staff toilet and his/her preferred cubicle, drain cistern abd replace water with 4 litres of 20 vols Hydrogen Peroxide, drain u bend in toilet add 2 liters of 0.1M Silver nitrate followed by 2 litres of 2 M Sodium Hydroxide solution . this precipitates finely divided silver oxide.. when Toilet is flushed 4l of peroxide + silver oxide = 80 l of oxygen gas Contents of toilet returned like Great geyser at Yellowstone usually to ceiling,, and stalagtites formed.. Warning, you Have to Really HATE the teacher...
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