Taxes
It was pleasing to note that the EU is considering banning the oft-used practice of budget airlines of advertising flights for "as little as 99p!" only to add large amounts of taxes and fees after you've decided to book the flight. But what amused me was a quote on the BBC website from Mike Pedley, principal researcher at Holiday Which?:
"For airlines it is common practice to separate out charges but consumers only get shown the full price at the end of the booking. This doesn't happen at the supermarket till, so why should buying flights be any different?"
Er... he's obviously never been to the US. Not that the tax is ever that much, but the thing I find most annoying is that you can never use up your loose change because, what with sales tax being an almost continuously varying function of ones position, it is impossible to work out what the total charge is going to be in advance.