The most vital part of a car?

I was drving the other day and this woman cut me up badly but the most annoying part of it was that because i was in someone elses car i completely missed the horn. So after I figured out where it was too late to use. So this made me resent the woman not because she cut me up but that I could not vent my frustration. This could have been fatal and was definately a huge flaw in car design.

There needs to be either enough horns that you can never miss it or just a huge one in the middle of steering wheel so that you can smack it.
Also a huge horn that destroy the person (who cut you up)'s ears

Perhaps like this:












Or this: