Have you ever gotten into your car and left your mug on your roof or hood? We all have.

It's not until we're driving — and others are beeping and waving their arms to warn us, or at the stop sign (if it's held on that long) when the mug falls and spills all over the hood — that we realize.

We tested this out with Mighty Mug and a professional stunt driver on a closed course. Check it out — and don't try this at home.