A man needs to inflate his tyres.
So he stops at a petrol station, and finds that the air pump needs a token from the petrol station shop in order to work.
The man goes in and asks for one of the tokens.
"That will be 25p" says the cashier, who he pays and gets the token.
The man returns to his car and starts inflating his tyres, and swears as he realises the machine ran out of time half way through.
He goes back into the shop and asks for another token.
"That will be 50p" says the cashier.
"What?!" exclaims the man "It was 25p a minute ago!"
The cashier shrugs and replies "That's inflation for you"