This is a joke I found from the amazing book What If? (why can't I italicize?) This superior piece of literature by Randall Munroe is him answering absurd and hypothetical questions with serious scientific answers. Is it possible to build a jetpack using downward- firing machine guns? What would happen if you tried to hit a baseball pitched at 90 percent the speed of light? These are some of the questions he covers in this book.
I want to make clear that this is not my joke. It is from What If? by Randall Munroe. (See the instructions box for more information or look it up)