Same with rubber duckies and plastic containers of Grey Poupon. Basically, you throw a Koosh ball back and forth between several cars. While you are moving. We've made the successful pass at 75 mph. It requires angling, remember.
Heavy traffic can be a hoot.
This game is awesome. It was introduced to me by Shepard Ritzen, Mike Wexler, Brian McLaughlin, and Matt Wolfe. One person is the driver. The other person is their bitch. The bitch sits in the backseat with a blindfold on.