True Story .... when I was working part time after leaving school to put myself thru College .... one staff member kept knocking off other people's lunches in the fridge, even tho they had their names on their packets. I used to bring bits in from my Home Economics course for people to 'try' ..... so I brought in some chocolates, leaving them in the fridge.
Same story as @Romla - everyone else had been told not to eat them, as I'd cut up a bar of Sunlight Soap & coated them in chocolate! He reported me to my supervisor, saying that I had tried to poison him - expecting me to get the sack! But when I explained the situation leading up to my 'test' ..... HE was the one that got the sack! ;)