Zero g's Given
And Not a Single g Was Given That Day
Right right right. Technically, no such thing as zero g, because gravity always exists everywhere. But "microgravity" just doesn't have the same ring to it, so please roll with it for the sake of the joke.
The device used to measure g forces is an accelerometer. *beat* Yessss, indeed. You just had the same thought we did. There's an app for that. We'll be right here while you go over and install that.
Back? Our lawyers made us add this note: any thrown phones or erratic braking you may experience while riding in vehicles driven by ThinkGeek customers over the next few days are NOT OUR FAULT. They're science's fault. Blame science.
The helmet of an astronaut on EVA from a space shuttle reflects a mushroom cloud over Earth with the words "Zero g's Given" in white ink on a black, 100% cotton shirt.