http://www.vivehypnosis.de/?p=5282
This is a slow cow transformation trigger. Whenever you (or anyone you allowed to use this trigger) moo(s), you will feel a wave of calm flooding your mind, along with a desire to moo more. With every further moo your human thoughts will slowly melt away and be replaced by the simple but happy mind of a cow and your desire to moo will increase more. Sooner or later you will also want to get on all fours, and every single moo will make your udders grow heavier and increase your desire to be milked.
You will slowly revert back to normal withing a few minutes once you stop mooing.