Shadow

What's as big as a dinosaur but weighs nothing? Her shadow!
What is as big as a steam locomotive, but weighs nothing? Its shadow.
Yo mama so fat her shadow weighs 35 pounds.
Why did the girl bring lipstick and eye shadow to school? She had a make-up exam!
What stays on the ground but never gets dirty? Shadow.
What is the same shape and size as a sequoia tree, but weighs nothing at all? The tree’s shadow.