Remember heading down to Cornwall as a youngster, in my parents old Ford Anglia. The car used to burn up and use more oil, than it did petrol. So much so, it dried out the back of your throat and so we had to have the windows rolled down to get rid of the fumes… If, and when we got rowdy in the back of the car, my dad told us many years later on, he used to get us to wind the windows up for a couple of minutes. Apparently that’s all the time it took for the fumes to knock us out cold… then he would wind the windows down again and drive on in peaceful bliss… Was too young to remember the finer details of this, but with my dad, you could never exactly know when he was telling us the truth, or pulling our leg :0)