Juggling

by Jeff

Image text: Later: 'Why is there a book hovering over the trash can?'

In this comic, the joke is that the "How to Juggle" book assumes that there is gravity in the place where you are.  It seems like there is no gravity because when Cueball throws the juggling balls up in the air, they don't come down.  Additionally, the image text tells us that someone else comes along and see that the juggling book is still hovering over the trash can and never went into it.