Milk
At Uni, in halls, milk thievery was rife. I would buy milk, put it in the fridge and it would be gone before I shut the door.

The only way to prevent this was to use a little psychology. Using a permanent marker, I would label the carton "Milk experiment".

No one ever touched the milk again.
( I have run out of coke is a little sweaty, Fri 19 Sep 2008, 9:37, 2 replies)

Lactomancy
I did something pretty similar. If, as Arthur C Clarke said, any sufficiently advanced technology is indistinguishable from magic then we reasoned that science must be the new sorcery.

We were far too cheap to buy milk. Instead we stole it from hall meals in little styrofoam cups that you were meant to use for takeaway soup. With the lid taped down, the date and an approximate temperature we left this little offering in the fridge guarded by the following spell "SCIENCE: DO NOT TOUCH!"

It worked for a bit.
(Ozz, Fri 19 Sep 2008, 9:50, closed)

Its calci-yummi !
I am liking the milk psychology! I always found the best way to stop the slackers who share your house from nicking your milk was to add a drop of green or blue food dye to it. Nothing puts people off food like something being "a little bit wrong with it." Makes your cornflakes more interesting too!
(OrangeMochaFrappuccino last watched Dexter on, Sun 21 Sep 2008, 17:57, closed)