And yet people perpetuate the myth. Some people are going to be mighty disappointed should they ever encounter a similar situation.As others have pointed out, you are definitely WRONG when it comes to new automobile purchases in California.
As for other states, I've asked about this at which states have a "cooling off"/return period on new cars? and never got any answer. If you know of any US states which have mandated cooling off periods or return periods on the purchase or lease of new automobiles, please point us to them and reputable pages that state it (e.g. that of the state govts).
Same goes for lemon law. Some people seem to think you can pull out a Michael Scott/The Office "I declare bankruptcy!" and it's a done deal. There is a process and it is more complex and difficult than just being unhappy with your situation.