To do knock knock poopy stomp:
Step 1: Get a paper sandwhich bag with dog poop inside
Step 2: Put it on someone's doorstep
Step 3: Light it on fire
Step 4: Knock louldy on door
Step 5: Run!
The person will answer the door, see the fire and attempt to put it out by stepping in the dog poop!
Damn! Someone knock knock poopy stomped me again! Now I have to get another new pair of shoes!