One for the Xmas cracker

[Jif]

The old one's are the best, stop me if you've heard it.

Two banjo players are doing the Sun crossword,

First banjo player -

'Old Mcdonald had one, four letters'

Second Banjo player -

'That'll be farm'

First banjo player -

'How do you spell that?'

Second banjo player -

'Think it's E-I-E-I-O'