how to stop some one stealing your milk

[igguh]

lace it with something very hot and watch when there throats on fire....then twat them for the trouble.

[iamhese]

Viagra comes to mind just image a 12hr shift with a hard on in a factory with 300 blokes !!!!
it would be entertaining in the changing rooms

if you choose viagra, use a jelly. it's more easy to mix in milk

[lickerdyslick]

I know it can be a balls ache and you feel like giving someone a good kicking, but in this day and age you have to be very careful what you do.
as sad as it may seem the only real answer is not to leave it or except it may not be there the next shift.

i think smoggy works on your day shift

[DogdySnigwirter]

Cyanacrylate : a clear watery liquid that is in fact a rapid set superglue ...

It stays liquid for a while but becomes instant set on contact.

And its cheap