A little bit of music hall (burlesque?)

as told to me by my son.
"I say I say I say, what's the difference between John Prescott and MFI?"
"I don't know, what is the difference between John Prescott and MFI?"
"There is no difference"
"There is no difference !!!???"
"No. With both of them a couple of screws in the wrong place and the whole cabinet falls apart"
Thank you - I'm here all week!