"TALKING GUITAR BLUES" by the great Lonnie Donegan. Still in my repertoire for open mic nights and still gets laughs. Has one of the best lines ever, I reckon:-

"...my pa, he took it a different way,
said - you c'n turn yer ma's hair grey,
drive yer sister away from home,
but you or me boy, gonna roam,
and I ain't leaving - you work it out..."