Willougby wallaby woo, an elephant sat on you
Willoughby wallaby wee, an elephant sat on me.
Willoughby wallaby (say the child's name with a 'w' replacing the first sound), an elephant sat on (say child's name correctly this time)
Continue with all of the names of the children in story time or different names that you can think of)
Examples:
Willoughby wallaby Wenry, an elephant sat on Henry,
Willoughby wallaby Waggie, an elephant sat on Maggie.