This is reputedly a true story rather than a joke but I find it funny, so I hope you do too.
Brain Clough would spend so much time in the bathroom every morning his wife would bang the door and shout " god are you still in there " to which Brian would reply " Barbara, it's alright to just call me Brian when we're at home " !!!
He once said modestly ‘Ah yes, Frank Sinatra, he met me once y’know?’ I recall a newspaper headline, following a match pitch invasion in which he had been assaulted that read:- ‘The fan hits the sh’t.’