Not entirely sabotaging food, but using food to sabotage other things
There was a long running game of "hide the mobile phone" while we were at Uni. Leave your phone unattended for even a second, and your loved ones has all been sent messages informing them of your desires to rim them, or how much you hate them and their fat arses etc... You would be lucky to get it back within a couple of hours.

One evening, my house mate was particularly drunk and had passed out, leaving his phone in the kitchen. So I wrapped it in cling film and sat it in a bowl of jelly. The idea was to watch him hunt high and low for it until he asked one of us to call it, and then laugh til we cried when he realised that the fridge was ringing.

Basically, jelly seems to have little respect for cling film and its attempts to keep liquids away. We returned the following day to find him sat eating his jelly, clutching his very sticky, extremely dead mobile.

The moral of the story: use zip lock bags next time
( Devon Dan without geometry, there would be no point, Thu 18 Sep 2008, 18:45, Reply)