I have to admit, I didn't know of this scam, that said I have a general level of distrust of taxi drivers anyway that I watch them like a hawk. Yes I realise 95% of taxi drivers are honest and it's not really fair for me to tar them all with the same brush (sorry skyring), it's just out of any type of "business" I've dealt in the past, cabbies are the one type that seem to consistently try it on.