Toot Your Own Horn

I wish the horn on my car had two settings:

First setting, a little toot that says:
"Excuse me kind sir, I would like to bring to your attention the fact that traffic signaling device has changed state. While I have no desire to precipitate your departure, I would like to proceed with my journey as expediently as possible. I thank you for your promt reaction in this matter."

Second setting, a fog horn that screams:
"HOLY CRAP WE'RE ALL GONNA DIE!"

That should cover most situations...