Sittin' on my fencepost, chewing my bubblegum (smak, smak, smak, smak!)
Playin' with my yo-yo, wee-oo! wee-oo!
When along came Herman the worm!
And he was THIS big <-- (show how big with your hands!)
And I said “YO, Herman, what’s happening dude?"
And he said "I just ate _____." <--(some thing/person)
(NOTE: Continue on and on, increasing the size of who/what he ate until he is small again because he just farted (or burped) ...good times!)