I love XKCD. If you’ve never heard of it and claim to be a geek, you are hereby ordered to surrender your geek card at once.

What If is where they ask the important things, like “If every person on Earth aimed a laser pointer at the Moon at the same time, would it change color?” or “If you went outside and lay down on your back with your mouth open, how long would you have to wait until a bird pooped in it?” (why would you want to know that?)

This week, they take on firearms and theorize about building a Machine Gun Jetpack with “Is it possible to build a jetpack using downward firing machine guns?”

I need to get my hands on a GSH-6-30… I wanna try something with a nearby mountain.

Also, that GAU-8 graphic would be awesome on a T-shirt.