She bumps into the car and activates the alarm

Eventually the tug of war came to a head, and Chelsea yelped and fell back, her shoulders striking the window of her car.

It wasn't too terribly hard, but it was enough to trigger the car alarm, which started blaring uncontrollably. I couldn't help but chuckle as Chelsea scrambled to her feet with a blush and unlocked her door, quickly starting the car and zooming from the scene as she left the towel for Rocky to chew on playfully.

I chuckled as I realized she had taken her own car rather than my own, the one with her stuff in it.