Joke at the end/beginning???

I' ve heard that song before. It's a very melodic and tender piece, I really would like to get the CD, but I can't seem to find out what the title of it is..

When ray is close to death in the car with dillan (val) val tells him a story to keep him awake and alert, about a guy that wanted a convertible, so he had his roof of his car sawed off. Than he goes somewhere and a mexican says dude what did you do? you changed the struture ofthe vehical, its gonna Taco on you, meaning collapse inward U like a taco..