I knew somebody who did something far worse.....chap about to set off for 4 month det in MPA, rather foolishly left his (unlocked) suitcase in the mess foyer whilst awaiting wheels to BZZ. Said wag thought it'd be a great wheeze to empty an out-of-date tin of anchovies into said suitcase, in the full knowledge that it wouldn't be opened again for around 24hrs whilst in transit to MPA.
His description of the ensuing smell which permeated every item of his clothing (and, I'm led to believe, the whole accom block) was nauseating enough in itself...
And then there's the 'CS tabs in the cigar lighter' trick...