On a tandem ride a couple years ago, we had a car following us in a weird way on a street where it could have easily passed. The driver even honked a couple times.

After what seemed like forever, he finally passed, and then pulled over a little ways down the road. Then he held something out the window.

Turns out, Brewer's id had bounced out of the trunk bag, and the driver retrieved it, and was trying to return it.