Scene: Me and Leah with a cart of books in the basement of the library at work.
Me: You want help with that?
Leah: Nah, I've got it now.
Me: Gaining momentum.
Leah: Yup. And now this downramp. See, gravity makes pushing this even easier.
Me: Yay gravity.
Leah: I love gravity.
Me: Wait a few years.