Have mercy been waitin' for the bus all day.. Have mercy been waitin' for the bus all day.. I got my brown paper bag and my take-home pay.. Have mercy old bus be packed up tight.. Have mercy old bus be packed up tight.. Well I'm glad just to get on and home tonight.. Right on that bus done got me back.. Right on that bus done got me back.. Well I'll be ridin' on the bus till I Cadillac.. - Billy Gibbons & Dusty Hill.