Way back in the days of real money I was working as a boilermaker at Shellhaven oil refinery.

Our teaboy used to charge threepence a cup for tea and threepence for a candy bar.

He would get really mad if his total did not add up to a multiple of threepence and would rant for hours about being ripped off.

So every so often we would throw an extra halfpenny in the kitty.