Aquilegia, that's a good one, EC; good to see you here, too!

Welcome, columbine. I looked through the first four pages that Google brought up, and ALL of the listings referred to a song. For reasons that I don't particularly care to find out, whoever wrote it surely must have changed the phrase 'cash on the barrelhead'.

Late edit: sorry for mantling you, Faldage--I didn't see yours at the time mine posted. Caught myself in a typo, too.