Shamelessly nicked from elsewhere:
Nigel Farage walks into a pub and says, 'I'll have a pint of beer please.' The barman pours a pint, then throws it all over Farage.
'What did you do that for?' says Farage, drenched to the skin.
'Because you're in a metaphor which illustrates the stupidity of asking for something but not stipulating how you wanted it delivered!'
'But I'm still thirsty, so I want a pint -this time in a glass!' says Farage.
'You can't ask again!' said the barman.
'Why not?' snivelled Farage.
'Democracy.' says the barman."