Hanging on to the bumper

Just heard an interesting relationship metaphor. Lorelai Gilmore says that Luke Danes is the driver of the car and she just wants to come along for the ride, but he won't let her in the car so instead of riding in the car, she is hanging on to the bumper. She says that she doesn't even want him to open the door for her, she would just like him to leave the passenger door unlocked. My wife and I have been watching the Gilmore Girls since the beginning and I'm thoroughly entertained by the lightning quick wit, and thoroughly convinced that noone thinks that fast.