Two in five people think the sickle - the money described in the Harry Potter books - is real, a survey has suggested.
Two in five people believe Harry Potter currency is real
As many as 25% of respondents believe credits, the currency from the Star Wars movies, is also legal tender abroad, says the poll.
Post Office figures show £28bn was spent by the British on holiday last year - up 6% from 2002.
UK holidaymakers tend to budget an average £233 for spending money on a one-week trip.
And the Post Office has predicted another increase this year of over 6% which would take the total spent overseas to more than £30bn.
Nearly 70% of UK travellers buy their currency a week before their departure.
The top five currencies sold through the Post Office are the Euro, the US dollar, the Cypriot pound, the Canadian dollar and the Turkish lira.