SUPER OOM (Moo spelled backwards) is the product you have been looking for if you do any tricks with milk - or would like to.  Nothing looks more innocent than a glass of milk!
 
To get started, all you do is mix a few drops of OOM with a glass of hot water.  A realistic looking milk solution will appear before your open eyes. You get approximately 6 fl. oz. of OOM which will make several gallons of milk like solution.