The lesson from this new video by Stuart Edge and Chad Future? Don’t leave your car running and expect a complete stranger to stop someone else from driving off with it.

For the prank, the two would stop their expensive car by a store, and ask random bystanders to keep an eye on it. Then, with the hidden cameras rolling, one of their friends would calmly get in and drive away. 

Sadly, very few of the people on guard even seemed to notice or care, though many simply assumed it was a friend driving off. 

For the icing on the prank, the original driver would return shocked that his car was apparently stolen right under the bystanders’ noses.