Introduction: Pig Rain: Need I Say More?
Step 1: Maker of Rain
Place stone to topmost block break two blocks below top
Step 2: Use
Aim at the bottom corner of the top block and spam your heart out. Once you start to lag hit the pink mass. CAUTION: don't make too many or you'll fly away. Also as DOK pointed out you have to be in creative to do this
Step 3: Aftermath