For an added touch, you can cover the can with red saran wrap to make people think you're going backwards.
Just kidding, don't do that. Safety first, kids.
~Not-"Not-So-Handy Andy" Jack
It's possible this kludge was only made to keep the trunk from flapping. Sure. That's it. Because if it were meant to keep someone from opening it, it would only work for someone on the inside right? And that would mean... never mind, I don't want to think about it.